countersuit

noun
coun·​ter·​suit | \ˈkau̇n-tər-ˌsüt \
variants: or less commonly counter-suit
plural countersuits also counter-suits

Definition of countersuit 

: an opposing lawsuit especially : a claim asserted by an opposing party in a lawsuit (such as a defendant) against the party bringing the original lawsuit (such as a plaintiff) : counterclaim decided to file a countersuit against her accuser The current appeal results from a patent infringement suit and countersuit between Apple Inc. ("Apple") and Samsung Electronics Co … Apple, Inc. v. Samsung Electronics Co., Ltd.

First Known Use of countersuit

1846, in the meaning defined above

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The first known use of countersuit was in 1846

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