bike

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bike [noun]

a bicycle

US /baɪk/ 
UK /baɪk/ 
Example: 

It would be better for the environment if more people used bikes rather than cars.

Oxford Essential Dictionary

bike

 noun (informal)
a bicycle or a motorbike:
I go to school by bike.

Longman Dictionary of Contemporary English

bike

I. bike1 S2 /baɪk/ BrE AmE noun [countable]
[Date: 1800-1900; Origin: bicycle]
1. a bicycle:
Let’s go for a bike ride.
by bike
They’ll be coming by bike.
2. informal a ↑motorcycle
3. on your bike! British English spoken used to tell someone rudely to go away
• • •
COLLOCATIONS
■ verbs
go somewhere by bike I usually go to work by bike.
ride a bike Her Dad taught her to ride a bike and to drive.
get on/off a bike He got off his bike and walked with her for a while.
rent a bike (also hire a bike British English) You can rent bikes and explore the island's cycle paths.
■ types of bike
a mountain bike (=a strong bicycle for riding over rough ground) They went out for a country ride on their mountain bikes.
a racing bike He bought a cool new racing bike.
an exercise bike (=used for exercising indoors) I usually go on the exercise bike and the rowing machine.
■ bike + NOUN
a bike ride We used to go for long bike rides in the summer holidays.
a bike race The Tour de France is a famous bike race.
a bike shed They used to meet behind the bike sheds at school.
a bike rack (=a metal frame that you can attach your bike to) All stations should provide bike racks for passengers.

Oxford Advanced Learner's Dictionary

bike

bike [bike bikes biked biking] noun, verb   [baɪk]    [baɪk] 

noun
(informal)
1. a bicycle
She got on her bike and rode off.
I usually go to work by bike.

see also  mountain bike, pushbike, quad bike

2. a motorcycle 
Word Origin:
late 19th cent.: abbreviation.  
Example Bank:
He got on his bike and rode off.
She came off her bike when it skidded on some wet leaves.
She pedalled her bike up the track.
She tried to pedal her bike up the track.
We had to push our bikes up the hill.
We watched the boys on their bikes.
Idiom: on your bike!

Derived Word: biking 

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition
 

bike / baɪk / noun [ C ]

A1 a bicycle:

It would be better for the environment if more people used bikes rather than cars.

My youngest child is learning to ride a bike.

B1 informal a motorcycle

Collins Advanced Learner’s English Dictionary

bike

[ba͟ɪk]
 ♦♦♦
 bikes, biking, biked

 1) N-COUNT A bike is a bicycle or a motorcycle. [INFORMAL]
 2) VERB To bike somewhere means to go there on a bicycle. [INFORMAL]
  [V adv/prep] I biked home from the beach.

Merriam-Webster's Advanced Learner's Dictionary

1bike /ˈbaɪk/ noun, pl bikes [count]
1 : bicycle
• She rode her bike to school.
• a bike path
2 : motorcycle
- see also dirt bike, motorbike