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alarm

An alarm is a device or call announcing a warning or danger. (noun)

A smoker detector is an example of an alarm.

Alarm means to warn of danger or to make someone afraid or distressed.
(verb)

  1. An example of alarm is Paul Revere riding through the towns to warn the people that the British were near.
  2. An example of alarm is to sneak up behind a person and shout to scare him or her.

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See alarm in Webster's New World College Dictionary

See alarm in American Heritage Dictionary 4

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