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alarm

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noun alarm pronunciation in American English /əˈlɑrm/ 
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singularalarm
pluralalarms
  1. 1
    [countable] a piece of electrical equipment that warns you of danger, especially by making a loud noise
    burglar/fire/smoke alarm:

    Every new house comes complete with smoke alarms.

    set off/trigger an alarm:

    The burglars left empty-handed after triggering the alarm.

  2. 2
    [countable] an alarm clock

    Did you hear my alarm go off this morning?

  3. 3
    [uncountable] fear or worry that something unpleasant or dangerous might happen

    There was a note of alarm in her voice.

    cause for alarm (=something to be frightened of or worried about):

    She will have to stay in the hospital tonight but there is no cause for alarm.

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