A2 a clock that you can set to wake you up at a particular time with a loud noise闹钟
More examples
Didn't you hear your alarm clock going off this morning?
He woke up with a jerk when the alarm clock went off.
This alarm clock takes two medium-sized batteries.
Anne's alarm clock rang for half an hour before she woke.
He set his alarm clock for 7.00 a.m.
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