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tripwire

trip·wire [ tríp wr ] (plural trip·wires)


noun 
Definition:
 
1. wire that activates equipment: a wire that activates a device such as a trap, alarm, or camera when it is pulled or disturbed

2. hidden wire for tripping people: a concealed length of wire or rope stretched across the ground for an enemy or intruder to trip over

3. U.S. something small that acts as trigger: a small military operation that could give rise to a larger military operation

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