A legal action or lawsuit filed in response to another lawsuit; a competing legal claim brought by the defendant.
From counter- + suit (from Old French suite, meaning a following or pursuit). A legal term for responsive litigation strategies.
When someone sues you, countersuit is your legal weapon—you don't just defend, you attack back with your own claims. Famous countersuit victories sometimes result in plaintiffs owing defendants money, completely reversing the original intent. It's why litigation sometimes called 'mutual destruction.'
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