tripwire

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tripwire /ˈtrɪpˌwajɚ/ noun
plural tripwires
tripwire
/ˈtrɪpˌwajɚ/
noun
plural tripwires
Learner's definition of TRIPWIRE
[count]
: a wire placed close to the ground which trips people, sets off an alarm, or causes an explosion when it is touched