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tripwire

[trip-wahyuh r]
noun
  1. a wire used to set off concealed explosives, as one stretched across a footpath to be struck and activated by the foot of an enemy soldier.
  2. a wire that activates a trap, camera, or other device when stepped on, tripped on, or otherwise disturbed.
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Origin of tripwire

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for tripwire

tripwire

noun
  1. a wire that activates a trap, mine, etc, when tripped over
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012