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Noun: trip wire
  1. (military) a small military force that serves as a first line of defence; if they become engaged in hostilities it will trigger the intervention of stronger military forces
     
  2. A wire stretched close to the ground that activates something (a trap, camera or weapon) when tripped over

Derived forms: trip wires

Type of: force, military force, military group, military unit, wire

Encyclopedia: Trip wire