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.
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