American English

treat

treat [verb] (DEAL WITH)

to behave towards someone or deal with something in a particular way

US /triːt/ 
UK /triːt/ 
Example: 

He treated his wife very badly.

Oxford Essential Dictionary

 verb (treats, treating, treated)

1 to behave in a certain way towards somebody or something:
How does your boss treat you?
Treat these glasses with care.

2 to think about something in a certain way:
They treated my idea as a joke.

3 to try to make a sick person well again:
Several people are being treated for burns.

4 to give yourself or another person something special or enjoyable:
I treated the children to an ice cream.

Longman Dictionary of Contemporary English

treat

I. treat1 S2 W1 /triːt/ BrE AmE verb [transitive]
[Word Family: noun: ↑treat, ↑treatment, ↑mistreatment; verb: ↑treat, ↑mistreat; adjective: ↑untreated, ↑treatable]
[Date: 1200-1300; Language: Old French; Origin: traitier, from Latin tractare; ⇨ ↑tractable]
1. BEHAVE TOWARDS SOMEBODY/SOMETHING [always + adverb/preposition] to behave towards someone or something in a particular way ⇨ treatment
treat somebody like/as something
She treats me like one of the family.
Penny doesn’t think her co-workers treat her as an equal.
He treated his automobiles almost as tenderly as he did his wife.
badly treated/well treated
The prisoners were well treated by their guards.
treat somebody with respect/contempt/courtesy etc
Despite her seniority, Margot was never treated with much respect.
treat somebody like dirt/a dog (=treat someone unkindly and without respect)
I don’t know why he stays with her – she treats him like dirt.
2. DEAL WITH SOMETHING [always + adverb/preposition] to deal with, regard, or consider something in a particular way ⇨ treatment
treat something as something
Please treat this information as completely confidential.
She treats everything I say as a joke.
treat something favourably/seriously/carefully etc
Any complaint about safety standards must be treated very seriously.
3. ILLNESS/INJURY to try to cure an illness or injury by using drugs, hospital care, operations etc ⇨ treatment:
It was difficult to treat patients because of a shortage of medicine.
treat somebody/something with something
Nowadays, malaria can be treated with drugs.
4. BUY SOMETHING FOR SOMEBODY to buy or do something special for someone that you know they will enjoy
treat somebody to something
We treated Mom to lunch at the Savoy.
I treated myself to a new dress.
5. PROTECT/CLEAN to put a special substance on something or use a chemical process in order to protect, clean, or preserve it ⇨ treatment:
sewage treated so that it can be used as fertilizer
⇨ ↑trick or treat
• • •
COLLOCATIONS
■ adverbs
well The majority of workers are well treated.
badly Why did he treat me so badly?
fairly/unfairly I just want to be treated fairly.
equally All people should be treated equally, whatever their age.
differently Should girls be treated differently from boys in school?
harshly The guards treated the prisoners harshly.
kindly The world had not treated him kindly.
■ phrases
treat somebody with respect/contempt/suspicion etc When you treat the kids with respect, they act responsibly.
treat somebody like dirt informal (=very badly and with no respect) He treated this wife like dirt.
• • •
THESAURUS
behave to do and say things that are good, bad, normal, strange etc: His teacher said he’d been behaving badly at school. | I’m not going to talk to her until she starts behaving reasonably. | Oh, be quiet! You’re behaving like a two-year-old.
act to behave in a particular way, especially in a way that seems unusual, surprising, or annoying to other people: Tina’s been acting very strangely lately. | What makes grown people act like that?
treat to behave towards someone or deal with someone in a particular way: She said that he’d treated her really badly throughout their two-year marriage. | I’m sick of my parents treating me like a child.
conform to behave in the way that most other people in your group or society behave: Young people sometimes want to rebel and therefore they refuse to conform. | Society typically brings pressure on individuals and groups to conform to civilised norms.
conduct yourself formal to behave in a particular way, especially in a situation where people will notice and judge the way you behave: Public figures have a duty to conduct themselves responsibly, even in their private lives. | By the end of the course, you should be able to conduct yourself with confidence in any meeting.

Oxford Advanced Learner's Dictionary

treat

▪ I. treat [treat treats treated treating] verb, noun   [triːt]    [triːt] 

 

verb  

 

BEHAVE TOWARDS SB/STH
1. to behave in a particular way towards sb/sth
~ sb/sth (with sth) to treat people with respect/consideration/suspicion, etc.
Treat your keyboard with care and it should last for years.
~ sb/sth like sth My parents still treat me like a child.

~ sb/sth as sth) He was treated as a hero on his release from prison.  

 

CONSIDER

2. ~ sth as sth to consider sth in a particular way
• I decided to treat his remark as a joke.

• All cases involving children are treated as urgent.

3. ~ sth + adv./prep. to deal with or discuss sth in a particular way

• The question is treated in more detail in the next chapter.  

 

ILLNESS/INJURY

4. ~ sb (for sth) (with sth) to give medical care or attention to a person, an illness, an injury, etc
She was treated for sunstroke.
• The condition is usually treated with drugs and a strict diet.

• The hospital treated forty cases of malaria last year.  

 

USE CHEMICAL

5. ~ sth (with sth) to use a chemical substance or process to clean, protect, preserve, etc. sth
• to treat crops with insecticide

• wood treated with preservative  

 

PAY FOR STH ENJOYABLE

6. ~ sb/yourself (to sth) to pay for sth that sb/you will enjoy and that you do not usually have or do
She treated him to lunch.
Don't worry about the cost— I'll treat you.
I'm going to treat myself to a new pair of shoes.
Verb forms:

 
Word Origin:
Middle English (in the senses ‘negotiate’ and ‘discuss a subject’): from Old French traitier, from Latin tractare ‘handle’, frequentative of trahere ‘draw, pull’. The current noun sense dates from the mid 17th cent.  
Collocations:
Injuries
Being injured
have a fall/an injury
receive/suffer/sustain a serious injury/a hairline fracture/(especially BrE) whiplash/a gunshot wound
hurt/injure your ankle/back/leg
damage the brain/an ankle ligament/your liver/the optic nerve/the skin
pull/strain/tear a hamstring/ligament/muscle/tendon
sprain/twist your ankle/wrist
break a bone/your collarbone/your leg/three ribs
fracture/crack your skull
break/chip/knock out/lose a tooth
burst/perforate your eardrum
dislocate your finger/hip/jaw/shoulder
bruise/cut/graze your arm/knee/shoulder
burn/scald yourself/your tongue
bang/bump/hit/ (informal) bash your elbow/head/knee (on/against sth)
Treating injuries
treat sb for burns/a head injury/a stab wound
examine/clean/dress/bandage/treat a bullet wound
repair a damaged/torn ligament/tendon/cartilage
amputate/cut off an arm/a finger/a foot/a leg/a limb
put on/ (formal) apply/take off (especially NAmE) a Band-Aid™/(BrE) a plaster/a bandage
need/require/put in/ (especially BrE) have (out)/ (NAmE) get (out) stitches
put on/rub on/ (formal) apply cream/ointment/lotion
have/receive/undergo (BrE) physiotherapy/(NAmE) physical therapy 
Example Bank:
Chemically treated hair can become dry and brittle.
Don't treat me like a child!
He is guilty and should be treated accordingly.
He treated the idea with suspicion.
Parents still tend to treat boys differently from girls.
She was treated for cuts and bruises.
The drug is effective at treating depression.
The timber has been treated with chemicals to preserve it.
These allegations are being treated very seriously indeed.
They deserve to be treated with patience and respect.
They treat their animals quite badly.
We can treat this condition quite successfully with antibiotics.
You need to treat this wood for woodworm.
the tendency to treat older people as helpless and dependent
Remember that chemically treated hair is delicate.
The crops are treated with insecticide.
The wood panels will become brittle if not treated with preservative.
Water is discharged from the sewage works after being treated.
You should treat people with more respect.
Idiom: treat somebody like dirt
Derived Word: treatable

Derived: treat somebody to something

Cambridge Advanced Learner's Dictionary

treat / triːt / verb [ T usually + adv/prep ] (DEAL WITH)

B2 to behave towards someone or deal with something in a particular way:

My parents treated us all the same when we were kids.

He treated his wife very badly.

It's wrong to treat animals as if they had no feelings.

I treat remarks like that with the contempt that they deserve.

Collins COBUILD Advanced Learner’s English Dictionary

treat

[tri͟ːt]
 ♦♦
 treats, treating, treated

 1) VERB If you treat someone or something in a particular way, you behave towards them or deal with them in that way.
  [V n with n] Artie treated most women with indifference...
  [V n as/like n] Police say they're treating it as a case of attempted murder...
  [V n adv] She adored Paddy but he didn't treat her well...
  [V n adv] The issues should be treated separately.
 2) VERB When a doctor or nurse treats a patient or an illness, he or she tries to make the patient well again.
  [V n with n] Doctors treated her with aspirin...
  [V n for n] The boy was treated for a minor head wound...
  [V n] An experienced nurse treats all minor injuries.
 3) VERB If something is treated with a particular substance, the substance is put onto or into it in order to clean it, to protect it, or to give it special properties.
  [be V-ed with n] About 70% of the cocoa acreage is treated with insecticide...
  [V n] It was many years before the city began to treat its sewage.
 4) VERB If you treat someone to something special which they will enjoy, you buy it or arrange it for them.
  [V n to n] She was always treating him to ice cream...
  [V pron-refl to n] Tomorrow I'll treat myself to a day's gardening...
  [V pron-refl] If you want to treat yourself, the Malta Hilton offers high international standards. [Also V n]
 5) N-COUNT If you give someone a treat, you buy or arrange something special for them which they will enjoy.
  Lettie had never yet failed to return from town without some special treat for him.
 6) N-SING: poss N If you say that something is your treat, you mean that you are paying for it as a treat for someone else. [SPOKEN]
 7) PHRASE: PHR after v If you say, for example, that something looks or works a treat, you mean that it looks very good or works very well. [BRIT, INFORMAL]
 to treat someone like dirtsee dirt
  The first part of the plan works a treat...
  The apricots would go down a treat.

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary: 

1treat /ˈtriːt/ verb treats; treat·ed; treat·ing
1 always followed by an adverb or preposition [+ obj] : to deal with or think about (something) especially in a particular way
• The author treats this issue in the next chapter.
• You should treat [=consider, regard] this information as top secret.
• He treats [=regards] everything I say as a joke.
• This situation must be treated with great care.
2 always followed by an adverb or preposition [+ obj] : to think of and act toward (someone or something) in a specified way
• I try to treat everyone equally.
• She treats the horse cruelly.
• They treated me like a member of their family.
• I was treated like a queen/criminal.
• My parents still treat me like a child.
• Try to treat everyone as an equal.
• Young people should always treat their elders with respect.
• He treated me like dirt. [=he was very rude, disrespectful, or unkind to me]
3 a : to pay for someone's food, drink, or entertainment

[no obj]

• Let's go out to dinner. I'll treat.

[+ obj]

- usually + to
• They treated us to lunch.
b [+ obj] : to provide (someone) with something pleasant or amusing - + to
• At the end of the concert, the band treated their fans to a new song.
- often used as (be) treated
• The people on the tour were treated to a rare glimpse of the bird. [=the people on the tour had the rare and enjoyable experience of seeing the bird]
c [+ obj] : to buy or get something special and enjoyable for (yourself) - + to
• He treated himself to some ice cream.
• She treated herself to a massage.
4 [+ obj]
a : to give medical care to (a person or animal)
• Doctors immediately treated the patient.
• She was treated for dehydration.
b : to deal with (a disease, infection, etc.) in order to make someone feel better or become healthy again
• She is taking medication to treat the condition.
• The infection can be treated with antibiotics.
5 [+ obj] : to put a chemical or other substance on or in (something) in order to protect it, preserve it, clean it, etc. - often + with
• He treated the wood with a waterproof sealant.
- often used as (be) treated
• The crops were treated with a pesticide.
• Has the water been treated?

rhythm and blues

rhythm and blues [noun]

a type of popular music of the 1940s and 1950s

US /ˌrɪð.əm ən ˈbluːz/ 
UK /ˌrɪð.əm ən ˈbluːz/ 

Longman Dictionary of Contemporary English

rhythm and blues

ˌrhythm and ˈblues BrE AmE noun [uncountable]
↑R & B (=a type of popular music)

Oxford Advanced Learner's Dictionary

rhythm and blues

ˌrhythm and ˈblues [rhythm and blues]       noun uncountable (abbr. R & B)
a type of music that is a mixture of blues and jazz and has a strong rhythm 
Culture:

Rhythm and blues was developed in the 1950s and 1960s and played especially by African Americans. Leading R and B stars included ‘Muddy’ Waters, Joe Turner, B B King and ‘Fats’ Domino.

 

 

Cambridge Advanced Learner's Dictionary

ˌ rhythm and ˈ blues noun [ U ] ( also R & B )

a type of popular music of the 1940s and 1950s

Collins COBUILD Advanced Learner’s English Dictionary

rhythm and blues

 N-UNCOUNT
 Rhythm and blues is a style of popular music developed in the 1940's from blues music, but using electrically amplified instruments. The abbreviation R & B is also used

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary: 

rhythm and blues

rhythm and blues noun [noncount] : a type of popular music performed by African-Americans that was developed originally by combining elements of blues and jazz - abbr. R & B;

appearance

appearance [noun] (WAY YOU LOOK)

the way a person or thing looks to other people

US /əˈpɪr.əns/ 
UK /əˈpɪə.rəns/ 
Example: 

There was nothing unusual about/in her physical appearance.

Oxford Essential Dictionary

appearance

 noun

1 the way that somebody or something looks or seems:
A new hairstyle can completely change your appearance.

2 the coming of somebody or something; when somebody or something is seen:
Jane's appearance at the party surprised everybody.
Is this your first appearance on television?

Longman Dictionary of Contemporary English

appearance

appearance W2 /əˈpɪərəns $ əˈpɪr-/ BrE AmE noun
[Word Family: verb: ↑appear ≠ ↑disappear, ↑reappear; noun: ↑appearance ≠ ↑disappearance, ↑reappearance]
1. WAY SOMEBODY/SOMETHING LOOKS [uncountable and countable] the way someone or something looks to other people:
He was always criticising his wife’s appearance.
appearance of
They’ve changed the appearance of the whole building.
We are often attracted to somebody first by their physical appearance.
Women, in general, tend to be more concerned than men about their personal appearance.
She had an outward appearance of calm, but deep down she was really worried.
The metal posts spoiled the appearance of the garden.
A garnish helps to enhance the appearance of any dish.
She’s the kind of woman who takes pride in her appearance.
You shouldn’t judge by appearances.
They work hard at school without giving the appearance of being particularly hard-working.
The case had all the appearances of a straightforward murder.
The pupils looked angelic – but appearances can be deceptive.
He was, to all appearances, a respectable, successful businessman.
2. SOMEBODY TAKES PART IN A PUBLIC EVENT [countable] when a famous person takes part in a film, concert, or other public event:
It was his first public appearance since the election.
He made his last appearance for the club in the Cup Final.
appearance money/fee (=money paid to a famous person to attend an event)
3. SOMETHING NEW STARTS TO EXIST [singular] when something new begins to exist or starts being used
appearance of
The industry has changed greatly with the appearance of new technologies.
the appearance of buds on the trees
4. ARRIVAL [countable usually singular] the unexpected or sudden arrival of someone or something
appearance of
Eileen was deep in concentration, and the sudden appearance of her daughter startled her.
5. keep up appearances to dress and behave in the way in which people expect you to, especially to hide your true situation:
She just wanted to keep up appearances for the kids.
6. for appearances’ sake/for the sake of appearances if you do something for appearances’ sake, you are trying to behave how people expect you to, especially to hide your true situation or feelings
7. put in an appearance/make an appearance to go to an event for a short time, because you think you should rather than because you want to:
At least Marc managed to put in an appearance at the party.
8. AT A LAW COURT/MEETING [countable] an occasion when someone goes to a court of law or official meeting to give information, answer questions etc:
He is due to make another court appearance on Monday.

Cambridge Advanced Learner's Dictionary

appearance / əˈpɪə.rəns /   / -ˈpɪr. ə ns / noun (WAY YOU LOOK)

B1 [ C or U ] the way a person or thing looks to other people:

a middle-aged man of smart appearance

You can alter/change the whole appearance of a room just by lighting it in a certain way.

There was nothing unusual about/in her physical appearance.

The large car outside the house gave the appearance of wealth (= suggested wealthy people lived there) .

Appearances can be deceptive.

to/from all appearances judging from what can be seen:

To all appearances their marriage is fine, but I think she gives him a bad time in private.

Word partners for appearance (BEING PRESENT)

a brief / fleeting / sudden appearance • a rare / recent / regular appearance • sb's farewell / final / first appearance • a personal / public appearance • make / put in an appearance • sb's appearance as sth • sb's appearance in sth

Word partners for appearance (WAY YOU LOOK)

the external / outward appearance • sb's personal / physical appearance • a dishevelled / scruffy / unkempt appearance • a striking appearance • improve your/sth's appearance

 

Collins COBUILD Advanced Learner’s English Dictionary

appearance

[əpɪ͟ərəns]
 ♦♦
 appearances

 1) N-COUNT: usu with supp, oft supp N When someone makes an appearance at a public event or in a broadcast, they take part in it.
  It was the president's second public appearance to date...
  Keegan made 68 appearances in two seasons for Southampton, scoring 37 times.
 2) N-SING: with supp Someone's or something's appearance is the way that they look.
  She used to be so fussy about her appearance...
  He had the appearance of a college student...
  A flat-roofed extension will add nothing to the value or appearance of the house.
 3) N-SING: with supp, oft N of n The appearance of someone or something in a place is their arrival there, especially when it is unexpected.
  The sudden appearance of a few bags of rice could start a riot.
  ...last Christmas, when there'd been the welcome appearance of Cousin Fred.
 4) N-SING: with supp, oft N of n The appearance of something new is its coming into existence or use.
  Flowering plants were making their first appearance, but were still a rarity...
  Fears are growing of a cholera outbreak following the appearance of a number of cases in the city.
 5) N-SING: with supp If something has the appearance of a quality, it seems to have that quality.
  We tried to meet both children's needs without the appearance of favoritism or unfairness...
  The US president risked giving the appearance that the US was taking sides.
 6) PHRASE: PHR with cl/group If something is true to all appearances, from all appearances, or by all appearances, it seems from what you observe or know about it that it is true.
  He was a small and to all appearances an unassuming man.
 7) PHRASE: V inflects If you keep up appearances, you try to behave and dress in a way that people expect of you, even if you can no longer afford it.
  His parents' obsession with keeping up appearances haunted his childhood.
 8) PHRASE: V inflects If you put in an appearance at an event, you go to it for a short time although you may not really want to, but do not stay.
  You must put in an appearance, at least, or she'll think you're avoiding her.
  Syn:
  show your face

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary: 

appearance

ap·pear·ance /əˈpirəns/ noun, pl -anc·es
1 somewhat formal : the way that someone or something looks

[count]

• The room has a neat/fresh/clean appearance. [=look]
• The general appearance of the house is quite good.
• The museum restored the painting to its original appearance.
• lotions that improve your skin's appearance and texture
• It minimizes the appearance of wrinkles. [=it makes wrinkles more difficult to see]
• You shouldn't judge a man by his appearance.
• Have you noticed any changes in her appearance?
• He's very proud of his physical appearance. [=the way he looks]

[noncount]

• He is still very youthful in appearance. [=he still looks very young]
• They are very similar in appearance. [=they look the same]
2 [count] : a way of looking that is not true or real
• He appears to be happy, but appearances can be deceptive/deceiving.
• Their expensive home created a false appearance of success and happiness.
• The furniture has the appearance of being made by hand. [=the furniture was not made by hand but it looks/appears as if it was]
Despite appearances, her company is very successful. = Appearances to the contrary, her company is very successful. [=her company is very successful even though it does not appear to be]
• She is only attending the banquet for the sake of appearances. [=because people think that she should attend]
• He was, to/by all (outward) appearances, a happily married man. [=he seemed to be a happily married man, but he wasn't]
• Their meetings tend to take on the appearance of [=to look like] family gatherings.
• His white beard gave him the appearance of an old man. [=made him look like an old man]
• The playground gives every appearance of being a safe place for children [=the playground appears to be a safe place for children], but a tragic accident occurred there recently.
3 [count] : the action of appearing : the fact that something or someone arrives or begins to be seen - usually singular
• The appearance of buds on the trees tells us that spring has arrived.
• We were surprised by the appearance of smoke in the distance.
• I wasn't expecting him to come and was surprised by his sudden appearance. [=I was surprised when he suddenly appeared/arrived]
4 [count] : the time when something begins to exist or is seen for the first time - usually singular
• The appearance [=creation] of the Internet has changed our culture in many ways.
• The technology made its first appearance [=appeared for the first time] in the early 1980s.
• Before the appearance of the telephone, people sent messages by telegraph.
5 [count] : an act of being seen or heard by the public as an actor, politician, athlete, etc.
• He has announced that this will be his final/last appearance with the band. [=the last time that he will perform in public with the band]
• This is her first appearance [=the first time that she has competed] at/in the national championships.
- often used with make
• She is making her first appearance at/in the national championships.
• Tonight, he is making his first public appearance since winning the award.
• He'll be making a special guest appearance [=performing as a guest] on the popular television show next fall.
6 [count] : the formal act of going in front of a person or group to speak, answer questions, etc.
• One man has been convicted of the crime, and two others are awaiting court appearances. [=waiting to go to court]
- often + before
• He is awaiting his appearance before a judge.
• She made an appearance before Congress last year.
keep up appearances : to hide something bad by pretending that nothing is wrong
• Although they were getting a divorce, my parents thought it was important to keep up appearances.
make an appearance or put in an appearance : to go to an event, gathering, etc., usually for a short period of time
• The candidate made an appearance at the rally.
• The governor put in an appearance at the party

reveal

reveal [noun]

to make known or show something that is surprising or that was previously secret

US /rɪˈviːl/ 
UK /rɪˈviːl/ 
Example: 

He was jailed for revealing secrets to the Russians.

Oxford Essential Dictionary

reveal

 verb (reveals, revealing, revealed )
to tell something that was a secret or show something that was hidden:
She refused to reveal any names to the police.

 

Longman Dictionary of Contemporary English

reveal

reveal W1 AC /rɪˈviːl/ BrE AmE verb [transitive]
[Word Family: adjective: ↑revealing, ↑revelatory; verb: ↑reveal; noun: ↑revelation; adverb: ↑revealingly]
[Date: 1300-1400; Language: Old French; Origin: reveler, from Latin revelare 'to uncover', from velum; ⇨ ↑veil1]
1. to make known something that was previously secret or unknown OPP conceal:
He may be prosecuted for revealing secrets about the security agency.
a test that can reveal a teacher’s hidden skills
reveal (that)
He revealed that he had been in prison twice before.
reveal yourself (as/to be something)
The violinist revealed himself as a talented interpreter of classical music.
2. to show something that was previously hidden OPP conceal:
The curtain opened to reveal the grand prize.
• • •
THESAURUS
reveal to let someone know about something that is secret or has not been known until now: Doctors are not allowed to reveal confidential information. | It was revealed that he had smoked marijuana at college.
tell to talk about something to someone, so that they know about it: Don’t tell anyone about this just yet. | Shall I tell you a secret?
disclose formal to publicly reveal something such as a fact or a name that has been kept secret: The terms of the agreement have not yet been disclosed. | The agent did not disclose that there had been a violent crime in the house.
divulge \daɪˈvʌldʒ, də-\ formal to reveal important or personal information which was previously secret or unknown: The bank has refused to divulge its plans. | I’m afraid I cannot divulge what was said to me.
make something public to tell people about important information, especially after it has been kept secret: Apparently they were engaged for some time before making it public. | The government has agreed that sources of financing should in future be made public.
leak to deliberately give secret information to a newspaper, television company etc, when a government or other organization wants to keep it secret: The contents of the email were leaked to the press. | A man was charged today with leaking official secrets.
give something away (also spill the beans informal) to tell someone something that you want to keep secret: He was careful not to give away any trade secrets. | I’m not going to give away how much I paid for it!
let slip informal to accidentally tell someone about something: He let slip that he was envious of his older brother.

Cambridge Advanced Learner's Dictionary

reveal / rɪˈviːl / verb [ T ]

B2 to make known or show something that is surprising or that was previously secret:

He was jailed for revealing secrets to the Russians.

[ + that ] Her biography revealed that she was not as rich as everyone thought.

[ + question word ] He would not reveal wh ere he had hidden her chocolate eggs.

C2 to allow something to be seen that, until then, had been hidden:

A gap in the clouds revealed the Atlantic far below.

Collins COBUILD Advanced Learner’s English Dictionary

reveal

[rɪvi͟ːl]
 ♦♦
 reveals, revealing, revealed

 1) VERB To reveal something means to make people aware of it.
  [V n] She has refused to reveal the whereabouts of her daughter...
  [V that] A survey of the British diet has revealed that a growing number of people are overweight...
  [it be V-ed that] After the fire, it was revealed that North Carolina officials had never inspected the factory...
  [V wh] No test will reveal how much of the drug was taken. [Also be V-ed as n]
 2) VERB If you reveal something that has been out of sight, you uncover it so that people can see it.
  [V n] In the principal room, a grey carpet was removed to reveal the original pine floor.
  Syn:
  show

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary: 

reveal

re·veal /rɪˈviːl/ verb -veals; -vealed; -veal·ing [+ obj]
1 a : to make (something) known
• She would not reveal the secret.
• The test revealed the true cause of death.
• It was revealed that they stole over $1 million.
• They revealed the plans for the new building.
- opposite conceal
b : to show or prove that (someone) is a particular type of person - often + to be
• The book reveals him to be an expert at chess.
• She revealed herself to be a talented pianist.
- often + as
• She revealed the reporter as a liar.
2 : to show (something) plainly or clearly : to make (something that was hidden) able to be seen
• The expression on his face revealed how he felt.
• The curtain was lifted to reveal the grand prize.
• Pulling up the carpeting revealed the home's beautiful hardwood floors.
- opposite conceal

grateful

grateful [adjective]

showing or expressing thanks, especially to another person

US /ˈɡreɪt.fəl/ 
UK /ˈɡreɪt.fəl/ 
Example: 

I'm so grateful ( to you) for all that you've done.

Oxford Essential Dictionary

grateful

 adjective
If you are grateful, you feel or show thanks to somebody:
We are grateful to you for the help you have given us.
The noun is gratitudeopposite ungrateful

Longman Dictionary of Contemporary English

grateful

grateful S3 W3 /ˈɡreɪtfəl/ BrE AmE adjective
[Word Family: noun: ↑gratitude ≠ ↑ingratitude, ↑ingrate; adverb: ↑gratefully; adjective: ↑grateful ≠ ↑ungrateful]
[Date: 1500-1600; Origin: grate 'pleasing, thankful' (16-17 centuries), from Latin gratus]
1. feeling that you want to thank someone because of something kind that they have done, or showing this feeling OPP ungrateful
grateful for
I’m so grateful for all your help.
grateful to
I am very grateful to all those who took the trouble to write to me.
grateful (that)
She should be grateful that he was making things easier for her.
extremely/deeply/eternally etc grateful
I am extremely grateful for the assistance your staff have provided.
Our grateful thanks go to all who participated.
She gave me a grateful look.
REGISTER
In everyday English, people usually say I appreciate it rather than I’m grateful:
Thanks, I’m really grateful. ➔ Thanks, I really appreciate it.
| I’m grateful for everything you've done. ➔ I appreciate everything you've done.
2. I would be grateful if you could/would ... formal used to make a request:
I would be most grateful if you could send me an invoice in due course.

Oxford Advanced Learner's Dictionary

grateful

grate·ful   [ˈɡreɪtfl]    [ˈɡreɪtfl]  adjective
1. feeling or showing thanks because sb has done sth kind for you or has done as you asked
~ (to sb) (for sth) I am extremely grateful to all the teachers for their help.
We would be grateful for any information you can give us.
~ (to do sth) She seems to think I should be grateful to have a job at all.
~ (that…) He was grateful that she didn't tell his parents about the incident.
• Grateful thanks are due to the following people for their help…

• Kate gave him a grateful smile.

2. used to make a request, especially in a letter or in a formal situation
I would be grateful if you could send the completed form back as soon as possible.
I would be most grateful if you would keep this matter confidential.
see grateful/thankful for small mercies at  small  adj.
Derived Word: gratefully  
Word Origin:
mid 16th cent.: from obsolete grate ‘pleasing, thankful’ (from Latin gratus) + -ful.  
Thesaurus:
grateful [grateful gratefully] adj.
I am grateful to everyone for their help.
thankfulgladrelievedappreciative|formal indebted
Opp: ungrateful
grateful/thankful for sth
grateful/indebted to sb
grateful/thankful/glad/relieved that…  
Word Family:
grateful adjective (≠ ungrateful)
gratefully adverb
gratitude noun (≠ ingratitude) 
Example Bank:
I am more than grateful for their generous response.
I'll be forever grateful for your help.
I'm eternally grateful that we managed to go there before the war.
I'm immensely grateful to you for your support.
I'm just grateful the injury is not as bad as we'd feared.
Thank you for your help. I really am most grateful.
We are deeply grateful to you and your family.
He was grateful that she didn't tell his parents about the incident.
• I would be grateful if you could send the completed form back as soon as possible.

• Kate gave him a grateful look.

Cambridge Advanced Learner's Dictionary

grateful / ˈɡreɪt.f ə l / adjective

B1 showing or expressing thanks, especially to another person:

I'm so grateful ( to you) for all that you've done.

If you could get that report finished by Thursday I'd be very grateful.

After the earthquake we felt grateful to be alive.

I'm just grateful that I'm not still working for him.

formal I would be most grateful if you would send me the book immediately.

→  Opposite ungrateful

 

gratefully / -i / adverb

She smiled at me gratefully.

Collins COBUILD Advanced Learner’s English Dictionary

grateful

[gre͟ɪtfʊl]
 ADJ-GRADED: usu v-link ADJ, usu ADJ to n, ADJ for n/-ing
 If you are grateful for something that someone has given you or done for you, you have warm, friendly feelings towards them and wish to thank them.
  She was grateful to him for being so good to her...
  I should like to extend my grateful thanks to all the volunteers.

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary: 

grate·ful /ˈgreɪtfəl/ adj [more ~; most ~] : feeling or showing thanks
• She was grateful (that) she didn't have to work on the holiday.
• the grateful [=thankful] recipient of a new heart
• The college sent us a grateful acknowledgment of our donation. : feeling or showing thanks to someone for some helpful act
• I'm grateful to you for your help.
• He's grateful for the attention.
• I'm grateful (to you) for this opportunity. = I'm grateful to have this opportunity. = I'm grateful that I have this opportunity.
• a grateful smile
- opposite ungrateful

play

play [noun] (ACTING)

a piece of writing that is intended to be acted in a theatre or on radio or television

US /pleɪ/ 
UK /pleɪ/ 
Example: 

the first act of the play was very boring

Oxford Essential Dictionary

play

 noun

1 (plural plays) a story that you watch in the theatre or on television, or listen to on the radio:
We went to see a play at the National Theatre.

2 (no plural) games; what children do for fun:
work and play
 

Longman Dictionary of Contemporary English

II. play2 S1 W2 BrE AmE noun
[Word Family: noun: ↑play, ↑interplay, ↑replay, ↑player, ↑playfulness; verb: ↑play, ↑outplay, ↑replay; adjective: ↑playful, ↑playable; adverb: ↑playfully]
[Language: Old English; Origin: plega]
1. THEATRE [countable] a story that is written to be performed by actors, especially in a theatre:
a play by Chekhov
This is a major theme of Miller’s plays.
play about
Edward Bond’s play about class war
2. AMUSEMENT [uncountable] things that people, especially children, do for amusement rather than as work:
Play is very important to a child’s development.
a play area
through play
The program aims to teach road safety through play.
at play
the happy shouts of children at play
3. EFFECT [uncountable] the effect or influence of something:
the free play of competition in the building industry
at play
There are a number of factors at play (=having an effect) in the current recession.
bring/put something into play (=use something or make it have an effect)
A complex system of muscles is brought into play for each body movement.
Political considerations do come into play (=have an effect) when making policy.
4. ACTION IN A GAME OR SPORT
a) [uncountable] the actions of the people who are playing a game or sport:
Rain stopped play after only an hour.
b) [countable] one particular action or set of actions during a game:
On the next play, Johnson ran 15 yards for a touchdown.
5. in play/out of play if a ball is in play or out of play, it is inside or outside the area in which the rules of the game allow you to hit, kick, catch etc the ball:
He kicked the ball out of play.
6. play on words a use of a word that is interesting or amusing because it can be understood as having two very different meanings SYN pun
7. play of light patterns made by light as it moves over a surface:
the play of light on the water
8. make a play for something to make an attempt to gain something:
He made a play for the leadership last year.
9. make a play for somebody to try to begin a romantic or sexual relationship with someone:
It’s obvious he was making a play for her.
10. LOOSENESS [uncountable] if there is some play in something, it is loose and can be moved:
There’s too much play in the rope.
⇨ ↑fair play, ↑foul play

Oxford Advanced Learner's Dictionary

noun  

 

 

CHILDREN
1. uncountable things that people, especially children, do for pleasure rather than as work
the happy sounds of children at play
• the importance of learning through play

• a play area  

 

 

IN THEATRE

2. countable a piece of writing performed by actors in a theatre or on television or radio
to put on (= perform) a play
a play by Shakespeare
• a radio play

see also  morality play, mystery play, Passion play  

 

 

IN SPORT

3. uncountable the playing of a game
Rain stopped play.
There was some excellent play in yesterday's match.
• The spectators were asked to be quiet during play.

see also  fair play, foul play

4. countable (NAmE) an action or move in a game

• a defensive play  

 

 

IN ROPE

5. uncountable the possibility of free and easy movement

• We need more play in the rope.  

 

 

ACTIVITY/INFLUENCE

6. uncountable the activity or operation of sth; the influence of sth on sth else
the free play of market forces
The financial crisis has brought new factors into play.

• Personal feelings should not come into play when you are making business decisions.  

 

 

OF LIGHT/A SMILE

7. uncountable (literary) a light, quick movement that keeps changing
the play of sunlight on water
more at call sth into play at  call  v., child's play at  child, the state of play at  state  n., all work and no play (makes Jack a dull boy) at  work  n.  
Word Origin:
Old English pleg(i)an ‘to exercise’, plega ‘brisk movement’, related to Middle Dutch pleien ‘leap for joy, dance’.  
Thesaurus:
play noun
1. U
the happy sounds of children at play
funamusemententertainmentpleasurerecreationrelaxation
do sth for fun/amusement/entertainment/pleasure/recreation/relaxation
2. C
a play by Shakespeare
dramacomedytragedyfarcesketch
a play/drama/comedy/tragedy/farce/sketch about sth
perform a play/drama/sketch
see a play/drama/comedy/sketch 
Example Bank:
At close of play he had scored 38 not out.
Children spend hours at play.
He kicked the ball out of play.
He made several nice defensive plays.
He was sent off for foul play.
I only said it in play.
Rain stopped play 40 minutes into the match.
The ball is still in play.
The children always perform a nativity play every Christmas.
The local council runs some good play schemes.
The offensive coordinator has called 60 running plays and 44 passes.
The play is reviewed in most of today's papers.
There were ten double plays completed.
They ran 10 plays inside the 30 in the fourth quarter.
a play about teenage runaways
the final play of the first half
the team's ability to execute a play
Kate's class decided to put on a play for the school.
The theatre was refused permission to stage the play.
They are performing a play by Pinter.
• a children's play area

• the happy sounds of children at play

 

Cambridge Advanced Learner's Dictionary

play / pleɪ / noun [ C ] (ACTING)

A2 a piece of writing that is intended to be acted in a theatre or on radio or television:

a radio play

"Did you see the play (= the performance of the play) on Thursday?" "No, I went on Wednesday night."

Collins COBUILD Advanced Learner’s English Dictionary

play

[ple͟ɪ]
 
 plays, playing, played

 1) VERB When children, animals, or perhaps adults play, they spend time doing enjoyable things, such as using toys and taking part in games.
  ...invite the children round to play...
  They played in the little garden...
  [V with n] Polly was playing with her teddy bear.
 N-UNCOUNT
 Play is also a noun. ...a few hours of play until the baby-sitter takes them off to bed.
 2) V-RECIP When you play a sport, game, or match, you take part in it.
  [pl-n V n] While the twins played cards, Francis sat reading...
  [V n with n] Alain was playing cards with his friends...
  [V n (non-recip)] I used to play basketball...
  [V for n (non-recip)] I want to play for my country...
  [V (non-recip)] He captained the team but he didn't actually play.
 N-UNCOUNT
 Play is also a noun. Both sides adopted the Continental style of play.
 3) VERB When one person or team plays another or plays against them, they compete against them in a sport or game.
  [V n] Northern Ireland will play Latvia...
  [V against n] I've played against him a few times.
 N-UNCOUNT
 Play is also a noun. Fischer won after 5 hours and 41 minutes of play.
 4) VERB When you play the ball or play a shot in a game or sport, you kick or hit the ball.
  [V n] Think first before playing the ball...
  [V n] Sikander Bakht played a bad shot...
  [V n adv] I played the ball back slightly.
 5) VERB If you play a joke or a trick on someone, you deceive them or give them a surprise in a way that you think is funny, but that often causes problems for them or annoys them.
  [V n on n] Someone had played a trick on her, stretched a piece of string at the top of those steps...
  [V n] I thought: `This cannot be happening, somebody must be playing a joke'.
 6) VERB If you play with an object or with your hair, you keep moving it or touching it with your fingers, perhaps because you are bored or nervous.
  [V with n] She stared at the floor, idly playing with the strap of her handbag.
  Syn:
  toy
 7) N-COUNT A play is a piece of writing which is performed in a theatre, on the radio, or on television.
  The company put on a play about the homeless...
  It's my favourite Shakespeare play.
 8) VERB If an actor plays a role or character in a play or film, he or she performs the part of that character.
  [V n] ...Dr Jekyll and Mr Hyde, in which he played Hyde...
  [V n] His ambition is to play the part of Dracula.
 9) V-LINK You can use play to describe how someone behaves, when they are deliberately behaving in a certain way or like a certain type of person. For example, to play the innocent, means to pretend to be innocent, and to play deaf means to pretend not to hear something.
  [V n] Hill tried to play the peacemaker...
  [V n] She was just playing the devoted mother...
  So you want to play nervous today? [Also V adj]
  Syn:
  act
 10) VERB You can describe how someone deals with a situation by saying that they play it in a certain way. For example, if someone plays it cool, they keep calm and do not show much emotion, and if someone plays it straight, they behave in an honest and direct way.
  [V it adj/adv] Investors are playing it cautious, and they're playing it smart.
 11) V-ERG If you play a musical instrument or play a tune on a musical instrument, or if a musical instrument plays, music is produced from it.
  [V n] Nina had been playing the piano...
  [V n] Two people played jazz on a piano...
  [V for n] He played for me...
  [V n n] Place your baby in her seat and play her a lullaby...
  The guitars played. [Also V n for n]
 12) V-ERG If you play a record, a compact disc, or a tape, you put it into a machine and sound is produced. If a record or tape is playing, sound is being produced from it.
  [V n] She played her records too loudly...
  [V n] Every evening in those days the BBC played `God Save The King'...
  [V n] The records were played on the radio...
  There is classical music playing in the background. [Also V n n]
 13) VERB If a musician or group of musicians plays or plays a concert, they perform music for people to listen or dance to.
  A band was playing...
  [V n] He will play concerts in Amsterdam and Paris.
  Syn:
  perform
 14) VERB When light plays somewhere, it moves about on a surface in an unsteady way. [LITERARY]
  [V prep] The sun played on the frosty roofs.
 15) PHRASE: V inflects (feelings) If you ask what someone is playing at, you are angry because you think they are doing something stupid or wrong. [INFORMAL]
  What the hell are you playing at?.
 16) PHRASE: V inflects When something comes into play or is brought into play, it begins to be used or to have an effect.
  The real existence of a military option will come into play...
  Breathing brings many muscles into play.
 17) PHRASE: V inflects, usu PHR in n If something or someone plays a part or plays a role in a situation, they are involved in it and have an effect on it.
  They played a part in the life of their community...
  The UN would play a major role in monitoring a ceasefire.
  ...the role played by diet in disease.
 18) to play ballsee ball
 to play your cards rightsee card
 to play it by earsee ear
 to play fairsee fair
 to play fast and loosesee fast
 to play second fiddlesee fiddle
 to play the fieldsee field
 to play with firesee fire
 to play the foolsee fool
 to play to the gallerysee gallery
 to play into someone's handssee hand
 to play hard to getsee hard
 to play havocsee havoc
 to play hostsee host
 to play safesee safe
 to play for timesee time
 to play truantsee truant
  Phrasal Verbs:
  - play along
  - play at
  - play around
  - play back
  - play down
  - play off against
  - play on
  - play out
  - play up
  - play upon

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary: 

play

2play noun, pl plays
1 [count] : a piece of writing that tells a story through the actions and words of characters and that is performed on a stage
• The play is based on a real-life event.
• He wrote, directed, and starred in the play.
plays by Shakespeare
• His fifth grade class is putting on a play about the first Thanksgiving.
• I've gone to all of my daughter's school plays.
• She's currently adapting a stage play [=a play that is written to be performed on a stage] for the big screen.
- see also mystery play, passion play, screenplay
2 [noncount] : activities that are done especially by children for fun or enjoyment
• The book discusses the role of play in a child's development.
• imaginative play
• As the saying goes, “All work and no play makes Jack a dull boy.”
• a safe play area
• the sounds of children at play [=the sounds of children playing]
- see also child's play
3 a [noncount] : the action that happens during a game
• Please, no talking during play.
• Rain held up play for an hour.
• The chess match finally ended after three hours of play.
• The two golfers were tied at the start of play yesterday.
• We were surprised with/by the other team's level/quality of play.
b : the time when a person playing a game is supposed to do something

[count]

• It's your play. [=(more commonly) turn]

[noncount]

• Roll the dice to determine the order of play. [=to decide who plays first, second, etc.]
4 [count] US : a particular action or set of actions that happens during a game: such as
a American football : a planned attempt to move the ball forward or to stop an opponent from moving the ball forward
• The quarterback called out the play to his teammates.
• He ran 50 yards on that last play.
• running/passing plays
• a defensive/offensive play
b baseball : an action that is done to try to get a player out
• He was called safe on a close play at first base.
- often used with make
• The shortstop made a great play to end the inning.
• She had a chance to catch the ball, but she failed to make the play.
- see also double play, triple play
c : the act of moving a piece in a game like chess or checkers
• the first/opening play [=move] of the game
5 [noncount] : the state of being active or having an effect
• the play of market forces
• She promotes the free play of ideas in her classroom.
• Several issues are at play [=are involved] in determining the price of gasoline.
• The students' creativity was brought/called/put into play on this last assignment. [=the students had to use their creativity]
• Two important factors come into play. [=are involved]
6 [noncount]
a : time when a musical recording is played by a radio station : airplay
• The song has been getting heavy radio play. [=radio stations have been playing the song frequently]
b US : attention in newspapers, on television, etc.
• The story has so far received little play in the press. [=has not gotten much attention in the press]
7 [count] : a humorous or clever way of using a word or phrase so that more than one meaning is suggested - + on
• The title of the article makes a play on the prime minister's last name.
• a play on the word's original meaning
• a clever play on words [=pun]
- see also wordplay
8 [noncount]
a : a function of a machine that causes recorded sounds or pictures to be heard or seen
• Press “Play” to start the movie.
b : time when a machine is being used to hear or see recorded sounds or pictures
• The CD player's batteries only provided three to four hours of play.
9 [singular] : the irregular or lively movement of something
• Look at the dazzling play of colors in this diamond.
• a play of shadow and light
10 [noncount] : loose and free movement of something (such as part of a machine)
• There's too much play in the car's steering wheel.
in/into play of a ball : in or into the area where players must stay in sports
• She tried to keep the ball in play, but it bounced out of bounds.
• He put the ball back into play.
make a play for : to try to get (someone or something)
• He made a play for her. [=he tried to start a romantic or sexual relationship with her]
• She made a play for the job, but she didn't get it.
out of play of a ball : outside the area where players must stay in sports
• The ball is out of play [=dead] if it crosses these lines.

- see also fair play, foul play, power play

exhibit

exhibit [noun]

an object that is shown to the public in a museum, etc

US /ɪɡˈzɪb.ɪt/ 
UK /ɪɡˈzɪb.ɪt/ 
Example: 

The museum has a fascinating collection of exhibits ranging from Iron Age pottery to Inuit clothing.

Longman Dictionary of Contemporary English

II. exhibit2 AC BrE AmE noun [countable]
[Word Family: noun: ↑exhibition, ↑exhibitor, ↑exhibit; verb: ↑exhibit]
1. something, for example a painting, that is put in a public place so that people can go to see it:
The exhibits date from the 17th century.
2. an object that is shown in court to prove whether someone is guilty or not:
Exhibit A is the hammer found next to the victim.
3. American English an exhibition:
a big exhibit in Milan

Oxford Advanced Learner's Dictionary

noun
1. an object or a work of art put in a public place, for example a museum, so that people can see it

• The museum contains some interesting exhibits on Spanish rural life.

2. a thing that is used in court to prove that sb is guilty or not guilty

• The first exhibit was a knife which the prosecution claimed was the murder weapon.

3. (NAmE) =  exhibition  (1)
The new exhibit will tour a dozen US cities next year.  
Word Origin:
late Middle English (in the sense ‘submit for consideration’, also ‘present a document as evidence in court’): from Latin exhibit- ‘held out’, from the verb exhibere, from ex- ‘out’ + habere ‘hold’.  
Example Bank:
The artist is now having her first solo exhibit in New York.
The exhibit features unique photographs of San Francisco in the 1900s.
The exhibit opened to the public on July 1.
The exhibit runs through February 1.
The library has a policy of mounting changing exhibits.
The library is celebrating its tenth anniversary with a special exhibit.
The museum features rotating exhibits.
There are forty gigantic works on exhibit.
a major exhibit of the painter's work
a traveling exhibit of antiques
an exhibit of video art
an exhibit on local history
• the museum's new exhibit space

• a Matisse exhibit at the National Gallery

Cambridge Advanced Learner's Dictionary

exhibit / ɪɡˈzɪb.ɪt / noun [ C ]

C1 an object that is shown to the public in a museum, etc.:

The museum has a fascinating collection of exhibits ranging from Iron Age pottery to Inuit clothing.

C1 US ( UK exhibition ) a collection of objects that is shown to the public in a museum, etc.:

Let's go see the new dinosaur exhibit.

legal a thing used as evidence (= proof that something is true) in a trial:

Is exhibit C the weapon that you say was used?

Collins COBUILD Advanced Learner’s English Dictionary

exhibit

[ɪgzɪ̱bɪt]
 exhibits, exhibiting, exhibited
 1) VERB If someone or something shows a particular quality, feeling, or type of behaviour, you can say that they exhibit it. [FORMAL]
  [V n] He has exhibited symptoms of anxiety and overwhelming worry...
  [V n] Two cats or more in one house will also exhibit territorial behaviour...
  [V n] The economy continued to exhibit signs of decline in September.
  Syn:
  demonstrate, show
 2) VERB: usu passive When a painting, sculpture, or object of interest is exhibited, it is put in a public place such as a museum or art gallery so that people can come to look at it. You can also say that animals are exhibited in a zoo.
  [be V-ed] His work was exhibited in the best galleries in America, Europe and Asia.
  [V-ed] ...a massive elephant exhibited by London Zoo in the late 19th Century.
  Derived words:
  exhibition N-UNCOUNT usu for/on N Five large pieces of the wall are currently on exhibition in London.
 3) VERB When artists exhibit, they show their work in public.
  By 1936 she was exhibiting at the Royal Academy.
 4) N-COUNT An exhibit is a painting, sculpture, or object of interest that is displayed to the public in a museum or art gallery.
  Shona showed me round the exhibits.
 5) N-COUNT An exhibit is a public display of paintings, sculpture, or objects of interest, for example in a museum or art gallery. [AM]
  ...an exhibit at the Metropolitan Museum of Art.(in BRIT, use exhibition)
 6) N-COUNT An exhibit is an object that a lawyer shows in court as evidence in a legal case.
 7) VERB If you say that someone exhibits something, you mean that they are showing it openly or publicly in order to be admired, noticed, or believed.
  [V n] Other women seemed content and even exhibited their bellies with pride...
  [V n] He seems to want to exhibit his shame.
  Syn:
  show off

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary: 

exhibit

2exhibit noun, pl -its [count]
1 a : an object or a collection of objects that have been put out in a public space for people to look at : something shown in an exhibition
• The show includes dozens of interesting exhibits.
b chiefly US : exhibition 2a
• Have you seen the new photography exhibit?
• a school art exhibit
2 : an object that is used as evidence in a court of law
• introduced the weapons into evidence as exhibits A and B
✦The phrase exhibit A is sometimes used to refer to someone or something that is being mentioned as evidence or proof of something, as if in a court of law.
• He says that the new regulations have hurt small businesses, and he offers his own company as exhibit A.
on exhibit : being publicly shown in an exhibition
• The photographs are on exhibit in the museum's west wing.
• The painting went on exhibit last week.
• The painting was put on exhibit.

lecture

lecture [noun]

a formal talk on a serious subject given to a group of people, especially students

US /ˈlek.tʃɚ/ 
UK /ˈlek.tʃər/ 
Example: 

We went to a lecture on Italian art.

Oxford Essential Dictionary

lecture

 noun
a talk to a group of people to teach them about something:
She gave a fascinating lecture on Spanish history.

Longman Dictionary of Contemporary English

lecture

I. lecture1 S2 W3 /ˈlektʃə $ -ər/ BrE AmE noun [countable]
[Word Family: noun: ↑lecture, ↑lecturer, ↑lectureship; verb: ↑lecture]
[Date: 1200-1300; Language: Late Latin; Origin: lectura 'act of reading', from Latin legere 'to read']
1. a long talk on a particular subject that someone gives to a group of people, especially to students in a university ⇨ speech
lecture on
He regularly gives lectures on modern French literature.
2. an act of criticizing someone or warning them about something in a long serious talk, in a way that they think is unfair or unnecessary
lecture on/about
My father caught me and gave me a long lecture about the dangers of drink.
• • •
COLLOCATIONS
■ verbs
give a lecture (also deliver a lecture formal) She gave a fascinating lecture on crime in the 1800s. | He delivered the lecture at the London School of Economics.
do a lecture informal: He’s doing a lecture on modern poetry.
go to a lecture (also attend a lecture formal) Have you been to any of Professor MacPherson’s lectures? | I recently attended a lecture by a noted historian.
listen to a lecture Most students spend about a quarter of their time listening to lectures.
■ lecture + NOUN
a lecture hall/room (also a lecture theatre British English) The lecture hall was packed.
lecture notes Can I borrow your lecture notes?
a lecture tour (=a trip that someone takes to many different places to give a lecture) He’s on a lecture tour of the US.
■ phrases
a series of lectures (also a course of lectures British English) a series of lectures on the history of art
■ adjectives
a public lecture (=a lecture which the general public are allowed to go to) He’s going to deliver a public lecture on politics in the Middle East.
an illustrated lecture (=a lecture with pictures such as slides) Mrs Robinson gave a fascinating illustrated lecture on Spanish history.
• • •
THESAURUS
speech a talk, especially a formal one about a particular subject, given to a group of people: The bridegroom usually makes a speech after the wedding. | In her speech, she proposed major changes to the welfare system. | the opening speech of the conference
address formal a speech that a very important person gives to a large group of people: the President's address to the nation | He was surrounded by security officers as he made his address.
talk an occasion when someone speaks to a group of people giving them information about a particular subject or about their experiences: I went to an interesting talk on the wildlife of Antarctica. | He's been asked to give a talk about his trip to India.
lecture a talk, especially on an ↑academic subject and given to students in a university: a lecture on 17th century French literature | Professor Black is giving the lecture.
presentation a talk in which you describe or explain a new product or idea, especially one you give for your company: I had to give a presentation to the board of directors. | He's making a presentation to the management of a well-known manufacturing company.
sermon a talk given by a priest or a religious leader: The vicar preached a sermon about the need for forgiveness.
statement a spoken or written announcement that someone makes in public, often to ↑journalists: The minister issued a short statement in which he said he had no plans to resign.

Oxford Advanced Learner's Dictionary

lecture

c·ture AW [lecture lectures lectured lecturing] noun, verb   [ˈlektʃə(r)]    [ˈlektʃər] 

 

noun ~ (to sb) (on/about sth)
1. a talk that is given to a group of people to teach them about a particular subject, often as part of a university or college course
to deliver/give a lecture to first-year students
to attend a series of lectures on Jane Austen

• a lecture room/hall

2. a long angry talk that sb gives to one person or a group of people because they have done sth wrong
I know I should stop smoking— don't give me a lecture about it.  
Word Origin:
late Middle English (in the sense ‘reading, a text to read’): from Old French, or from medieval Latin lectura, from Latin lect- ‘read, chosen’, from the verb legere.  
Thesaurus:
lecture noun C
Dr Lee gave a lecture on public art.
talkspeechaddresssermon
a/an inaugural/farewell/keynote lecture/speech/address
an informal lecture/talk
give/deliver a/an lecture/talk/speech/address/sermon
write/prepare a/an lecture/talk/speech/address/sermon 
Collocations:
Education
Learning
acquire/get/lack (an) education/training/(BrE) (some) qualifications
receive/provide sb with training/tuition
develop/design/plan a curriculum/(especially BrE) course/(NAmE) program/syllabus
give/go to/attend a class/lesson/lecture/seminar
hold/run/conduct a class/seminar/workshop
sign up for/take a course/classes/lessons
School
go to/start preschool/kindergarten/nursery school
be in the first, second, etc. (NAmE) grade/(especially BrE) year (at school)
study/take/drop history/chemistry/German, etc.
(BrE) leave/finish/drop out of/ (NAmE) quit school
(NAmE) graduate high school/college
Problems at school
be the victim/target of bullying
(BrE) play truant from/ (both BrE, informal) bunk off/skive off school (= not go to school when you should)
(both especially NAmE) skip/cut class/school
(BrE) cheat in/(NAmE) cheat on an exam/a test
get/be given a detention (for doing sth)
be expelled from/be suspended from school
Work and exams
do your homework/(BrE) revision/a project on sth
work on/write/do/submit an essay/a dissertation/a thesis/an assignment/(NAmE) a paper
finish/complete your dissertation/thesis/studies/coursework
hand in/ (NAmE) turn in your homework/essay/assignment/paper
study/prepare/ (BrE) revise/ (NAmE) review/ (NAmE, informal) cram for a test/an exam
take/ (both BrE) do/sit a test/an exam
(especially BrE) mark/ (especially NAmE) grade homework/a test
(BrE) do well in/ (NAmE) do well on/ (informal, especially NAmE) ace a test/an exam
pass/fail/ (informal, especially NAmE) flunk a test/an exam/a class/a course/a subject
University
apply to/get into/go to/start college/(BrE) university
leave/graduate from law school/college/(BrE) university (with a degree in computer science)
study for/take/ (BrE) do/complete a law degree/a degree in physics
(both NAmE) major/minor in biology/philosophy
earn/receive/be awarded/get/have/hold a master's degree/a bachelor's degree/a PhD in economics 
Synonyms:
speech
lecture address talk sermon
These are all words for a talk given to an audience.
speecha formal talk given to an audience: Several people made speeches at the wedding.
lecturea talk given to a group of people to tell them about a particular subject, often as part of a university or college course: a lecture on the Roman army a course/series of lectures
addressa formal speech given to an audience: a televised presidential address
speech or address?
A speech can be given on a public or private occasion; an address is always public: He gave an address at the wedding.
talka fairly informal session in which sb tells a group of people about a subject: She gave an interesting talk on her visit to China.
sermona talk on a moral or religious subject, usually given by a religious leader during a service: to preach a sermon
a long/short speech/lecture/address/talk/sermon
a keynote speech/lecture/address
to write/prepare/give/deliver/hear a(n) speech/lecture/address/talk/sermon
to attend/go to a lecture/talk 
Example Bank:
I don't need any lectures from you on responsibility.
I don't take lectures from anyone on how to behave.
I got a lecture from Dad about coming home on time.
I have a lecture at nine tomorrow.
Professor Pearson gave the inaugural lecture in the new lecture theatre.
She gave me a stern lecture on ingratitude.
She referred to Professor Jones's work in her lecture on Shakespeare's imagery.
She wasn't at the lecture.
The fire alarm went during his lecture.
The society is putting on a series of lectures on the subject next term.
a familiar figure on the international lecture circuit
a lecture by Professor Snow
a lecture entitled ‘How to Prevent Food Poisoning’
a lecture to the Darwin Society
He gave a very interesting and informative lecture on the Roman army.
I know I should stop smoking— don't give me a lecture about it.
• a lecture room/hall

• a lecture theatre

Cambridge Advanced Learner's Dictionary

lecture / ˈlek.tʃə r /   / -tʃɚ / noun [ C ]

B1 a formal talk on a serious subject given to a group of people, especially students:

We went to a lecture on Italian art.

Who's giving the lecture this afternoon?

→  Compare seminar

an angry or serious talk given to someone in order to criticize their behaviour:

My dad gave me a lecture on the evils of alcohol last night.

Collins COBUILD Advanced Learner’s English Dictionary

[le̱ktʃə(r)]
 ♦♦♦
 lectures, lecturing, lectured

 1) N-COUNT A lecture is a talk someone gives in order to teach people about a particular subject, usually at a university or college.
  ...a series of lectures by Professor Eric Robinson...
  In his lecture Riemann covered an enormous variety of topics.
 2) VERB If you lecture on a particular subject, you give a lecture or a series of lectures about it.
  [V on/in n] She then invited him to Atlanta to lecture on the history of art...
  She has danced, choreographed, lectured and taught all over the world...
  [V n on n] Wendy Rigby was recently invited to lecture a group of doctors on the benefits of aromatherapy.
 3) VERB If someone lectures you about something, they criticize you or tell you how they think you should behave.
  [V n about/on n] He used to lecture me about getting too much sun...
  [V n] Chuck would lecture me, telling me to get a haircut...
  She was no longer interrogating but lecturing. [Also V n to-inf]
 N-COUNT
 Lecture is also a noun. Our captain gave us a stern lecture on safety.

 

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary: 

1lec·ture /ˈlɛkʧɚ/ noun, pl -tures [count]
1 : a talk or speech given to a group of people to teach them about a particular subject
• a lecture about/on politics
• She's planning to give/deliver a series of lectures on modern art.
• Several hundred people are expected to attend the lecture.
2 : a talk that criticizes someone's behavior in an angry or serious way
• I came home late and got a lecture from my parents.
• I gave her a lecture about doing better in school.

real

real [adjective] (NOT FALSE)

being what it appears to be and not false

US /ˈriː.əl/ 
UK /rɪəl/ 
Example: 

what is her real name?

Oxford Essential Dictionary

real

 adjective

1 existing, not just imagined:
The film is about events that happened in real life.

2 actually true, not only what people think is true:
The name he gave to the police wasn't his real name.

3 natural; not false or a copy:
This ring is real gold.

4 big or complete:
I've got a real problem.

Longman Dictionary of Contemporary English

real

I. real1 S1 W1 /rɪəl/ BrE AmE adjective
[Word Family: noun: ↑realism, ↑realist, ↑reality, ↑unreality, ↑realization; adverb: ↑real, ↑really, ↑realistically ≠ ↑unrealistically; adjective: ↑real, ↑unreal, ↑realistic ≠ ↑unrealistic; verb: ↑realize]
[Date: 1400-1500; Language: Old French; Origin: Medieval Latin realis 'of things (in law)', from Latin res 'thing']
1. IMPORTANT something that is real exists and is important:
There is a real danger that the disease might spread.
We need to tackle the real problems of unemployment and poverty.
There is no real reason to worry.
2. NOT ARTIFICIAL something that is real is actually what it seems to be and not false or artificial OPP fake:
a coat made of real fur
She had never seen a real live elephant before.
Artificial flowers can sometimes look better than the real thing.
3. NOT IMAGINARY something that is real actually exists and is not just imagined:
The children know that Santa Claus isn’t a real person.
Dreams can sometimes seem very real.
Things don’t happen quite that easily in real life.
4. the real world used to talk about the difficult experience of living and working with other people, rather than being protected at home, at school, or at college:
the shock of leaving university and going out into the real world
5. TRUE [only before noun] actual and true, not invented:
That’s not her real name.
What was the real reason you quit your job?
6. FEELINGS a real feeling or emotion is one that you actually experience and is strong SYN genuine:
There was a look of real hatred in her eyes.
I got a real sense of achievement when my work was first published.
7. RIGHT QUALITIES [only before noun] a real thing has all the qualities you expect something of that type to have:
I remember my first real job.
Simon was her first real boyfriend.
• • •
SPOKEN PHRASES
8. FOR EMPHASIS [only before noun] used to emphasize how stupid, beautiful, terrible etc someone or something is:
Thanks – you’ve been a real help.
The house was a real mess.
9. for real seriously, not just pretending:
After two trial runs we did it for real.
10. are you for real? American English used when you are very surprised or shocked by what someone has done or said
11. get real! used to tell someone that they are being very silly or unreasonable
12. keep it real to behave in an honest way and not pretend to be different from how you really are
13. MONEY [only before noun] a real increase or decrease in an amount of money is one you calculate by including the general decrease in the value of money over a period of time:
a real increase of 6% in average wages
The average value of salaries has fallen in real terms (=calculated in this way).
• • •
THESAURUS
genuine used about a feeling, thing, or person that really is what they seem to be: genuine concern | Experts believe that the painting is genuine. | genuine refugees | a genuine reason for taking time off work | If a student has genuine religious objections to a school activity, they do not have to participate.
real not false or artificial: real wood | His real name is Reginald. | It looks just like the real thing. | Are those flowers real or artificial?
authentic authentic food, music, clothes etc are correct for the place or the period in history that they are supposed to be from: It’s a friendly restaurant offering authentic Greek food. | authentic medieval instruments | The dancers wore authentic Native American designs.
true [only before noun] having all the qualities you would expect a particular type of person or thing to have: a true friend | She is a true professional. | Being a true Red Sox fan, he never missed a game. | True Christians believe that Jesus is the Son of God.
bona fide /ˌbəʊnə ˈfaɪdi $ ˈbəʊnə faɪd/ [usually before noun] bona fide people or things are really what they say they are, especially when this can be checked by looking at official documents: a bona fide medical qualification | a bona fide company | This club is only open to bona fide members.
hard evidence/facts evidence or facts that are genuine and can be proved: There was no hard evidence to support the theory.

Cambridge Advanced Learner's Dictionary

real / rɪəl /   / riː.əl / adjective (NOT FALSE)

[ before noun ] being what it appears to be and not false:

real leather/fur

Is that a toy gun or the real thing ?

→  Synonym genuine

[ before noun ] UK approving (especially of foods) produced using traditional methods and without artificial substances:

The pub sells several kinds of real ale (= traditional beer) .

for real informal real, not pretended:

I thought it was just a fire practice but apparently it was for real.

Collins COBUILD Advanced Learner’s English Dictionary

real

[ri͟ːl]
 
 1) ADJ Something that is real actually exists and is not imagined, invented, or theoretical.
  No, it wasn't a dream. It was real...
  Legends grew up around a great many figures, both real and fictitious.
  Syn:
  genuine
  Ant:
  imaginary
 2) ADJ-GRADED: usu v-link ADJ, oft ADJ to n If something is real to someone, they experience it as though it really exists or happens, even though it does not.
  Whitechild's life becomes increasingly real to the reader.
 3) ADJ: usu ADJ n A material or object that is real is natural or functioning, and not artificial or an imitation.
  ...the smell of real leather...
  Who's to know if they're real guns or not?...
  Desmond did not believe the diamond was real.
  Syn:
  genuine
  Ant:
  fake, imitation
 4) ADJ: ADJ n You can use real to describe someone or something that has all the characteristics or qualities that such a person or thing typically has.
  ...his first real girlfriend...
  He's not a real alcoholic...
  The only real job I'd ever had was as manager of the local cafe.
  Syn:
  proper
 5) ADJ: ADJ n You can use real to describe something that is the true or original thing of its kind, in contrast to one that someone wants you to believe is true.
  This was the real reason for her call...
  Her real name had been Miriam Pinckus.
  Syn:
  true
 6) ADJ: ADJ n You can use real to describe something that is the most important or typical part of a thing.
  When he talks, he only gives glimpses of his real self...
  The smart executive has people he can trust doing all the real work.
  ...a solo journey to discover the real America.
  Syn:
  true
 7) ADJ-GRADED: usu ADJ n (emphasis) You can use real when you are talking about a situation or feeling to emphasize that it exists and is important or serious.
  Global warming is a real problem...
  The prospect of civil war is very real...
  There was never any real danger of the children being affected...
  Political defeat seemed a real possibility at the end of 1981...
  At least they have a real chance to find work.
 8) ADJ-GRADED: ADJ n (emphasis) You can use real to emphasize a quality that is genuine and sincere.
  You've been drifting from job to job without any real commitment...
  Germany has shown real determination to come to terms with the anti-Semitism of its past.
 9) ADJ: ADJ n (emphasis) You can use real before nouns to emphasize your description of something or someone. [mainly SPOKEN]
  `It's a fabulous deal, a real bargain.'...
  `You must think I'm a real idiot.'
 10) ADJ: ADJ n The real cost or value of something is its cost or value after other amounts have been added or subtracted and when factors such as the level of inflation have been considered.
  ...the real cost of borrowing.
  Syn:
  actual, net
 PHRASE: PHR with cl
 You can also talk about the cost or value of something in real terms. In real terms the cost of driving is cheaper than a decade ago... Pensions have increased in real terms over the last twenty years.

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary: 

1re·al /ˈriːjəl/ adj
1 : actually existing or happening : not imaginary
• The movie is based on real events.
• The detective Sherlock Holmes is not a real person.
• He has no real power; he is just a figurehead.
• The battle scenes in the movie seemed very real to me.
• The team has a real chance at winning.
• There is a very real possibility that we will be moving to Maine.
• In real life, relationships are not perfect.
• The actor looks taller on TV than he does in real life.
• I finally got to talk to a real live person [=an actual person] instead of a machine.
• He's always daydreaming and seems to be out of touch with the real world.
• Their son finally went out into the real world [=the world where people have to work, deal with daily problems, etc.] and got a job.
2 : not fake, false, or artificial
real [=genuine] leather
• a real diamond
• Your real friends [=the people who are truly your friends] would be here to help you.
• What is his real name?
• Tell me the real reason you need the money.
3 : important and deserving to be regarded or treated in a serious way
• This is a very real problem/danger/concern.
• They have avoided talking about the real issues.
• There is no real reason to worry.
4 always used before a noun
- used for emphasis
• There's a real surprise at the end of the movie.
• Receiving this award is a real thrill.
• He's being a real jerk.
5 : strong and sincere
• I have no real interest in sports. [=I'm not very interested in sports]
• He made a real effort to improve his grades.
• There was a look of real [=genuine] astonishment on her face.
• She showed real delight/happiness when I told her the good news.
6 always used before a noun finance : measured by what money can actually buy at a particular time
• a real increase in wages as compared to inflation
• Charitable donations declined in real dollars last year.
for real informal
1 : true and genuine
• The information is for real.
2 US
a : honest and serious
• He convinced us that he was for real and really wanted to help.
• Is that guy for real?
b : genuinely good, skillful, etc.
• The team has proven that it's for real this year. [=has proven that it's good and has a real chance of winning]
3 : seriously or truly
• He's in trouble for real. [=he's really in trouble]
• They were just pretending to argue before, but now they're doing it for real.
get real informal : to start to think in a serious or reasonable way : to stop having foolish ideas, hopes, etc.
• We have to get real about this problem.
• You think you can get into Harvard with those grades? Get real.
keep it real informal : to talk and behave in an honest and serious way that shows who you really are
• He says he's just trying to keep it real.
the real deal
- see 3deal
the real McCoy
- see mccoy
the real thing
- see thing

tune

tune [noun] (MUSICAL NOTES)

a series of musical notes, especially one that is pleasant and easy to remember

US /tuːn/ 
UK /tjuːn/ 
Example: 

He was humming a tune as he dried the dishes.

Oxford Essential Dictionary

 noun
a group of musical notes that make a nice sound when you play or sing them together:
I know the tune but I don't know the words.

Longman Dictionary of Contemporary English

tune

I. tune1 S3 /tjuːn $ tuːn/ BrE AmE noun
[Date: 1300-1400; Origin: tone]
1. [countable] a series of musical notes that are played or sung and are nice to listen to SYN melody:
That’s a nice tune.
She sang some old classics and a few new tunes.
to the tune of something (=using the same tune as another song)
The song was sung to the tune of "Amazing Grace".
2. in tune playing or singing the correct musical note:
They sang perfectly in tune.
3. out of tune playing or singing higher or lower than the correct musical note:
Greg’s bass guitar was out of tune.
4. in tune with somebody/something, out of tune with somebody/something able or unable to realize, understand, or agree with what someone else thinks or wants:
The industry is changing in tune with changing demand.
5. to the tune of $1,000/£2 million etc informal used to emphasize how large an amount or number is:
Canada is funding the programme to the tune of $30 million.
call the tune at ↑call1(9), ⇨ change your tune at ↑change1(14), ⇨ dance to sb’s tune at ↑dance2(4), ⇨ ↑fine-tune, ↑signature tune
• • •
COLLOCATIONS
■ verbs
play a tune He played a tune on the piano.
hum/whistle a tune She was humming a little tune to herself.
write/compose a tune They wrote many great tunes together in the 80s.
■ ADJECTIVES/NOUN + tune
catchy/memorable (=one that is easy to remember) His songs have simple words and catchy tunes.
the theme tune/signature tune (=the tune at the beginning or end of a television programme etc) the theme tune from the movie 'Titanic'
a show tune (=a tune from a musical) Broadway show tunes
a dance tune The DJ played some bouncy dance tunes.
a hymn tune a rousing hymn tune

Oxford Advanced Learner's Dictionary

tune

 

tune [tune tunes tuned tuning] noun, verb   [tjuːn]    [tuːn] 

 

noun countable
a series of musical notes that are sung or played in a particular order to form a piece of music
He was humming a familiar tune.
I don't know the title but I recognize the tune.
It was a catchy tune (= song).
a football song sung to the tune of (= using the tune of) ‘When the saints go marching in’
see also  signature tune, theme tune 
more at call the shots/tune at  call  v., change your tune at  change  v., dance to sb's tune at  dance  v., he who pays the piper calls the tune at  pay  v., sing a different tune at  sing  
Word Origin:
late Middle English: unexplained alteration of tone. The verb is first recorded (late 15th cent.) in the sense ‘celebrate in music, sing’.  
Collocations:
Music
Listening
listen to/enjoy/love/be into music/classical music/jazz/pop/hip-hop, etc.
listen to the radio/an MP3 player/a CD
put on/play a CD/a song/some music
turn down/up the music/radio/volume/bass
go to a concert/festival/gig/performance/recital
copy/burn/rip music/a CD/a DVD
download music/an album/a song/a demo/a video
Playing
play a musical instrument/the piano/percussion/a note/a riff/the melody/a concerto/a duet/by ear
sing an anthem/a ballad/a solo/an aria/the blues/in a choir/soprano/alto/tenor/bass/out of tune
hum a tune/a theme tune/a lullaby
accompany a singer/choir
strum a chord/guitar
Performing
form/start/get together/join/quit/leave a band
give a performance/concert/recital
do a concert/recital/gig
play a concert/gig/festival/venue
perform (BrE) at/in a concert/(especially NAmE) a concert
appear at a festival/live
go on/embark on a (world) tour
Recording
write/compose music/a ballad/a melody/a tune/a song/a theme song/an opera/a symphony
land/get/sign a record deal
be signed to/be dropped by a record company
record/release/put out an album/a single/a CD
be top of/top the charts
get to/go straight to/go straight in at/enter the charts at number one 
Example Bank:
He hummed a little tune as he washed the dishes.
He softly hummed the tune to himself.
He wasn't allowed in the choir because he couldn't hold a tune.
She gave us a tune on the piano.
The crowd were singing ‘Give us jobs!’ to the tune of ‘Happy Birthday’.
The crowd were singing ‘Give us jobs, not more cuts!’ to the tune of ‘Happy Birthday To You’.
The kids were picking out a popular tune on the old piano.
a collection of classic tunes
an old jazz tune
I don't know the title but I recognize the tune.
It was a catchy little tune.
It's sung to the tune of ‘When the saints go marching in’.
Idioms: in of tune  the tune of something

Derived: tune in  tune in to somebody  tune out  tune somebody out  tune something up  tune up 

Cambridge Advanced Learner's Dictionary

tune / tjuːn /   / tuːn / noun (MUSICAL NOTES)

A2 [ C ] a series of musical notes, especially one that is pleasant and easy to remember:

He was humming a tune as he dried the dishes.

a theme tune

That's a very catchy tune (= easy to remember and pleasant) .

→  Synonym melody

in tune

C1 singing or playing notes that are at the right pitch (= level) or that agree with others being sung or played

out of tune C1 singing or playing notes that are at the wrong pitch (= level) or that do not agree with others being sung or played:

I'm afraid the piano is out of tune.

Collins COBUILD Advanced Learner’s English Dictionary

tune

[tju͟ːn, AM tu͟ːn]
 ♦♦♦
 tunes, tuning, tuned

 1) N-COUNT A tune is a series of musical notes that is pleasant and easy to remember.
  She was humming a merry little tune.
  Syn:
  melody
 2) N-COUNT You can refer to a song or a short piece of music as a tune.
  She'll also be playing your favourite pop tunes.
 3) VERB When someone tunes a musical instrument, they adjust it so that it produces the right notes.
  [V n] `We do tune our guitars before we go on,' he insisted.
 PHRASAL VERB
 Tune up means the same as tune. V P n (not pron) Others were quietly tuning up their instruments.
 4) VERB: usu passive When an engine or machine is tuned, it is adjusted so that it works well.
  [be V-ed] Drivers are urged to make sure that car engines are properly tuned.
 PHRASAL VERB
 Tune up means the same as tune. V P n (not pron) The shop charges up to $500 to tune up a Porsche.
 5) VERB: usu passive If your radio or television is tuned to a particular broadcasting station, you are listening to or watching the programmes being broadcast by that station.
  [be V-ed to n] A small colour television was tuned to an afternoon soap opera.
 6) → See also fine-tune, signature tune, tuning fork
 7) PHRASE: V inflects If you say that a person or organization is calling the tune, you mean that they are in a position of power or control in a particular situation.
  Who would then be calling the tune in Parliament?
 8) PHRASE: V inflects (disapproval) If you say that someone has changed their tune, you are criticizing them because they have changed their opinion or way of doing things.
  You've changed your tune since this morning, haven't you?...
  Yesterday he changed his tune, saying the fare increase was experimental.
 9) PHRASE: V inflects (disapproval) If you say that someone is dancing to someone else's tune, you mean that they are allowing themselves to be controlled by the other person.
  The danger of commercialism is that the churches end up dancing to the tune of their big business sponsors.
 10) PHRASE: PHR after v, v-link PHR A person or musical instrument that is in tune produces exactly the right notes. A person or musical instrument that is out of tune does not produce exactly the right notes.
  It was just an ordinary voice, but he sang in tune...
  Many of the notes are out of tune...
  It's no wonder the piano kept going out of tune.
 11) PHRASE: v-link PHR, PHR n If you are in tune with a group of people, you are in agreement or sympathy with them. If you are out of tune with them, you are not in agreement or sympathy with them.
  Today, his change of direction seems more in tune with the times...
  The peace campaigners were probably out of tune with most Britons.
 12) PHR-PREP: PREP amount To the tune of a particular amount of money means to the extent of that amount.
  They've been sponsoring the World Cup to the tune of a million and a half pounds.
 13) he who pays the piper calls the tunesee piper
  Phrasal Verbs:
  - tune in
  - tune out
  - tune up

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary: 

1tune /ˈtuːn, Brit ˈtjuːn/ noun, pl tunes [count] : a series of musical notes that produce a pleasing sound when played or sung
• I can't get that tune [=song] out of my head.
• an upbeat dance tune
• He played a delightful little tune [=melody] on the piano.
• The concert featured popular Broadway show tunes. [=songs from musicals]
call the tune informal : to be in charge or control of something
• She called the tune all through the meeting.
change your tune or sing a different tune informal : to change the way you talk about something : to have a different opinion about something
• He bragged that the test was easy, but when he saw his grade he changed his tune.
• Now he's singing a different tune.
• They say they're not worried about money, but once they see how much the new equipment will cost, they'll be singing a different tune.
dance to someone's tune
- see 1dance
in tune
1 : in a state in which the correct musical sound is played or sung
• The guitar was in tune.
2 a : in a state in which people agree with or understand one another
• The president and his followers were clearly in tune.
- usually + with
• They were clearly in tune with each other.
• The speaker was very much in tune with our concerns. [=understood and shared our concerns]
• The new supervisor is not in tune with the needs of the staff. [=does not understand/appreciate the needs of the staff]
b : in a state in which one thing agrees with or matches another - usually + with
• His formal clothing was in tune with the occasion.
out of tune
1 : in a state in which the correct musical sound is not played or sung
• The piano was out of tune.
2 a : in a state in which people do not agree with or understand one another - usually + with
• His speech was completely out of tune with our concerns.
b : in a state in which one thing does not agree with or match another - usually + with
• His values are out of tune with the times.
to the tune of
1 : using the tune of (a particular song)
• Amusing lyrics were sung to the tune of [=to the music of the song] “New York, New York.”
2 informal
- used to emphasize a large amount of money
• A telecommunications company funded the event to the tune of [=at a cost of] several million dollars.

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