overturn

Universal Words verb 1 if sth overturns, or if sb overturns it, it turns upside down or on its side: [V] The car skidded and overturned. * [VN] He stood up quickly, overturning his chair. 2 [VN] to officially decide that a legal decision etc. is not correct, and to make it no longer valid: to overturn a decision / conviction / verdict * His sentence was overturned by the appeal court.