If you are sued for breaching a contract and you, in turn, also file suit against the plaintiff and claim thathe was really the one who breached the contract, your claim against the original plaintiff is an example of a counterclaim.
intransitive verbcoun·ter·claimed, coun·ter·claim·ing, coun·ter·claims
counterclaim - Legal Definition
- Yugoslavia's relations with Albania, though simplified by this decision, have been affected by the Albanian counterclaim to Pee, Djakovo and the plain of Kosovo, where since the middle of last century the Albanian element had grown steadily stronger at the expense of the Serbs.
- The claim that Apollo can in every case purify from sin is met by Athens with a counterclaim on behalf of the state.