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English definition of “tripwire”

tripwire

noun [C]     /ˈtrɪp.waɪər/ US  /-waɪr/
a wire stretched low above the ground that operates an explosive device, a gun, or a device for catching animals when it is touched by the foot of a person or animalHunting
(Definition of tripwire noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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