ambuscade

• The act of concealing yourself and lying in wait to attack by surprise (synset 101249473)
  hypernym: coup de main, surprise attack - an attack without warning
  hyponym: dry-gulching - the act of killing from ambush
  synonym: ambush, lying in wait, trap

• Wait in hiding to attack (synset 201140630)
  hypernym: wait - stay in one place and anticipate or expect something
  synonym: ambush, bushwhack, lie in wait, lurk, scupper, waylay

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