Definition of tripwire noun from the Oxford Advanced Learner's Dictionary

 

tripwire

 noun
noun
BrE BrE//ˈtrɪpwaɪə(r)//
 
; NAmE NAmE//ˈtrɪpwaɪər//
 
 
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a wire that is stretched close to the ground as part of a device for catching somebody/something if they touch it
See the Oxford Advanced American Dictionary entry: tripwire