alarm clock

alarm clock

US /əˈlɑːrm ˌklɑːk/ 
UK /əˈlɑːm ˌklɒk/ 

a clock that makes a noise at a particular time to wake you up

 

ساعت زنگ دار - alarm clock
Persian equivalent: 

Oxford Essential Dictionary

alarm clock

 (also alarm) noun
a clock that makes a noise to wake you up:
She set the alarm clock for half past six.

 

clocks

Longman Dictionary of Contemporary English

alarm clock

aˈlarm clock BrE AmE noun [countable]

clock that makes a noise at a particular time to wake you up

Oxford Advanced Learner's Dictionary

alarm clock

 

aˈlarm clock [alarm clock alarm clocks]       (also alarm) noun

a clock that you can set to ring a bell, etc. at a particular time and wake you up
I set the alarm clock for 7 o'clock.

See also: alarm

Cambridge Advanced Learner's Dictionary

alarm (clock)

alarm (clock) noun [C]
a clock that you can set to wake you up at a particular time with a loud noise:
I've set the alarm for 7.30.
The alarm went off at 7.30.

Collins COBUILD Advanced Learner’s English Dictionary

alarm clock

 alarm clocks
 N-COUNT
 An alarm clock is a clock that you can set to make a noise so that it wakes you up at a particular time.
  I set my alarm clock for 4.30.
 Syn:
 alarm

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