trip wire

Noun
  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 (synset 108002823)
    referred to in: armed forces, armed services, military, military machine, war machine - the military forces of a nation
    is a type of: force, military force, military group, military unit - a unit that is part of some military service
  2. A wire stretched close to the ground that activates something (a trap or camera or weapon) when tripped over (synset 104492842)
    is a type of: wire - ligament made of metal and used to fasten things or make cages or fences etc

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