trip wire
1. a small military force that serves as a first line of defense; if they become engaged in hostilities it will trigger the intervention of stronger military forces • Topics: military, armed forces, armed services, military machine, war machine • Hypernyms: military unit, military force, military group, force 2. a wire stretched close to the ground that activates something (a trap or camera or weapon) when tripped over • Hypernyms: wire
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