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silent alarm
noun
- 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.
Example Sentences
Twice the operation was interrupted by police officers who came to Sinay’s office when she accidentally set off a silent alarm, but for the most part the copying proceeded without mishap.
Police contacted Ms Leonard after a priority 999 call from a silent alarm system in her home had been logged.
China’s nosedive in childbearing is a silent alarm.
An estimated 43 percent of public schools have a “panic button” or silent alarm that connect directly with the police in case of emergency, up from 29 percent five years ago.
The teller walked away while another employee activated a silent alarm, and the man left without any money.
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