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tripwire

[trip-wahyuh r] /ˈtrɪpˌwaɪər/
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.
Origin
trip1 + wire
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for trip wire

tripwire

/ˈtrɪpˌwaɪə/
noun
1.
a wire that activates a trap, mine, etc, when tripped over
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
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