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. 2013.
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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.
Cite This Source
00:10
Burglar alarm is always a great word to know.
So is doohickey. Does it mean:
a fool or simpleton; ninny.
a gadget; dingus; thingumbob.
Example sentences
Furthermore, you'd better have a good burglar alarm system or a reliable guard
  dog because house break-ins are frequent.
Unfortunately, they're necessary, and so is the burglar alarm.
The burglar alarm went off in the middle of the night, as alarms do all over
  this city every night.
Thus each place cell fired for only one location, much as would a burglar alarm
  tied to a particular tile in a hallway.
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