countersuit
Noun
Meaning
a suit brought against someone who has sued you
Source: WordNetSynonyms
Hypernyms
Examples
After Tool filed a countersuit stating that Volcano had failed to use a renewal option in their contract, the parties settled out of court.
It was a reporter at a local law magazine, asking for comment on a new countersuit filed by Keith Davidson, Daniels’s former lawyer, who was claiming Avenatti and Daniels had defamed him.
Johnson (1993), 16. Adams filed a countersuit, claiming the case was in poor taste and frivolous, and that, as author of the Nancy Drew series, she retained the rights to her work.
Tripp further addresses this particular incident in his countersuit.