See tit for tat in Webster's New World Roget's A-Z Thesaurus II
noun
The act of retaliating:
counteraction, counterattack, counterblow, reciprocation, reprisal, requital, retaliation, retribution, revenge, vengeance. Idioms: an eye for an eye, a tooth for a tooth, like for like , measure for measure . See attack, forgiveness
Learn more about tit for tat