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silent alarm

an alarm that alerts security personnel or the police without the knowledge of the intruder or criminal whose presence triggers it:
The silent alarm set off a flashing light at the police station.
any visual rather than audible alarm. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for silent alarm
Historical Examples
  • She advanced a few steps, her eyes resting on him in silent alarm.

    My Lady's Money Wilkie Collins
  • Until now the silent alarm had been little more than a plaything.

    The Silent Alarm Roy J. Snell
  • He had banged his head on the pillow six times over-night, and this silent alarm proved effective, as it always does.

    Mike P. G. Wodehouse
  • By the aid of the silent alarm she had received a message from her.

    The Silent Alarm Roy J. Snell
  • And then, some silent alarm clicked into place in Sabo's mind, tightening his stomach, screaming to be heard.

    Derelict Alan Edward Nourse
  • Maybe that's why I didn't show up any better, here the other night, when Vee rings in this silent alarm on me.

    The House of Torchy Sewell Ford
  • “The silent alarm,” she murmured as she hastily drew from her pocket two dark cylinders.

    The Silent Alarm Roy J. Snell

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