: a complaint made in response to another complaint or by a person or group who was complained against
The US said it would file a complaint with the new World Trade Organization after 20 months of negotiations with Japan failed to open that country's market to US autos and auto parts. Tokyo said it will file a countercomplaint with the WTO.—The Christian Science Monitor
The defendants filed several affirmative defenses to the complaint and filed a countercomplaint against the plaintiff hospital. —Methodist Medical Center v. Taylor, 489 NE 2d 351 (1986)
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