verb (v)

• take revenge for a perceived wrong(verb.competition)

  Synonym:
  avenge, revenge
  

  source: wordnet30
• make a counterattack and return like for like, especially evil for evil(verb.competition)

  Example:
  The Israeli army retaliated for the Hamas bombing.
  

  Synonym:
  strike back
  

  source: wordnet30
• To return the like for; to repay or requite by an act of the same kind; to return evil for (evil). [Now seldom used except in a bad sense.](verb)

  source: webster1913
• To return like for like; specifically, to return evil for evil; as, to retaliate upon an enemy.(verb)

  source: webster1913