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tr.v. coun·ter·sued, coun·ter·su·ing, coun·ter·sues Law
To respond to a lawsuit against oneself by suing (the plaintiff).

coun′ter·suit′ (-so͞ot′) n.


vb (tr)
(Law) law to sue (a plaintiff) in response or opposition to a preceding lawsuit
References in periodicals archive ?
I reckon the dog should countersue him for three undecillion Dentastix, or at least take the guy on Judge Judy.
Mr Zerbib denies the accusations and intends to countersue for defamation.
The museum sued; the mayor threatened to countersue.
If they go ahead with this ridiculous plan, I'm going to countersue France for allowing their women to have hairy armpits.
Company Believes Complaint is Without Merit and Intends to Countersue for Double Dipping