alarm clock

noun

1. a clock with a bell or buzzer that can be set to sound at a particular time, as to awaken someone.

alarm clock

noun

1. a clock with a mechanism that sounds at a set time: used esp for waking a person up

Word History and Origins

Origin of alarm clock¹

First recorded in 1690–1700

Example Sentences

However analogue clocks will need switching manually, especially important if you are relying on an old-fashioned alarm clock to wake you up.

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Sunrise alarm clocks can help with that too - they mimic daylight and start gradually getting brighter before they ring.

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Documents submitted to court during Zou's trial show he searched online for "hidden camera" and "electric alarm clock camera" on the same day and made purchases on eBay of surveillance equipment.

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“He let me have the insides of an alarm clock ... that was the beginning of it.”

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In this as in so many other ways, Donald Trump serves as history’s alarm clock.

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Related Words

• clock radio