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alarm

 
 
/əˈlɑːm/ noun

Definition

WARNING [C] a loud noise that warns you of danger: a fire alarm to set off an alarm
CLOCK [C] (also alarm clock) a clock that makes a noise to wake you
WORRY [U] a sudden feeling of fear or worry that something bad might happen: There's no need for alarm - it is completely safe.
→ See also burglar alarm → See also false alarm
(Definition of alarm noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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