Simple past tense and past participle of counterclaim.(verb)
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Use "counterclaimed" in a sentence
"Neutrogena counterclaimed, but its allegations were not at issue on this motion."
"BDI counterclaimed for false advertising, tortious interference, and related business torts."
"Defendants (the main one, Kari-Out, is both a customer and a competitor: it redistributes the VERSAtainer to various clients and sells its own food containers) counterclaimed for false advertising, trade libel, tortious interference, etc."