trip wire

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• March 4. 2016 from wordnet.princeton.edu

  trip wire — noun — english

  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

• March 4. 2016 from wordnet.princeton.edu

  trip wire — noun — english

  a wire stretched close to the ground that activates something (a trap or camera or weapon) when tripped over