retaliate

To do something in response to an action done to oneself or an associate, especially to attack or injure someone as a response to a hurtful action.

To pay back (an injury) in kind.

To return in kind; repay or requite by an act of the same kind: now seldom or never used except in the sense of returning evil for evil.

To return like for like; especially (now usually), to return evil for evil.

Synonyms See revenge, n.