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alarm clock

From Wiktionary

Word parts

[change]

alarm + clock

Noun

[change]

Singular
alarm clock

Plural
alarm clocks

An alarm clock
  1. (countable) An alarm clock is a clock that makes a sound at a certain time. People use alarm clocks to wake up from sleep at a time they choose.
    He set the alarm clock for 5.30am as he wanted to wake up early.