alarm clock · noun C /əˈlɑrm.klɑk/Full view
alarm clock
A2 a clock that you can set to wake you up at a particular time with a loud noise
Dictionary examples:

My alarm clock went off at 5:00.

I've set the alarm clock for 7:30.

Learner example:

He gave me an alarm clock so I won't be late [for] school any more. (Key English Test; A2; Portuguese)

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