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English definition of “alarm clock”

alarm clock

noun [C] uk   (also alarm) us  
A2 a clock that you can set to wake you up at a particular time with a loud noise: My alarm clock went off at 7.30. I've set the alarm for 7.30.Watches and clocks
(Definition of alarm clock from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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