burglar alarm

noun
an automatic device for giving an alarm when a window, door, safe, etc., is opened or tampered with, as by a burglar.

Origin:
1830–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
burglar alarm

noun
1. a loud warning signal produced by a burglar alarm; "they could hear the burglar alarm a mile away" 
2. a warning device that is tripped off by the occurrence of a burglary 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Furthermore, you'd better have a good burglar alarm system or a reliable guard
  dog because house break-ins are frequent.
Thus each place cell fired for only one location, much as would a burglar alarm
  tied to a particular tile in a hallway.
The majority of burglar alarm activations are not by bad guys.
The burglar alarm went off in the middle of the night, as alarms do all over
  this city every night.
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