tripwire

[trip-wahyuhr]
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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Collins
World English Dictionary
tripwire (ˈtrɪpˌwaɪə)
 
n
a wire that activates a trap, mine, etc, when tripped over

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
All of these tripwire rods or other safety devices must be manually reset to restart the machine.
Safety tripwire cables are located around the perimeter of or near the danger area.
Tripwire features custom-built sensors hidden inside coconuts that are hung from trees at several public locations.
He rigged a couple of shotguns to a tripwire and loaded them up.
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