Definition of alarm clock noun from the Oxford Advanced Learner's Dictionary


alarm clock

BrE BrE//əˈlɑːm klɒk//
; NAmE NAmE//əˈlɑːrm klɑːk//
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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 (4)
See the Oxford Advanced American Dictionary entry: alarm clock