overturn
over·turn [overturn overturns overturned overturning] BrE [ˌəʊvəˈtɜːn] NAmE [ˌoʊvərˈtɜːrn] verb
1. intransitive, transitive if sth overturns, or if sb overturns it, it turns upside down or on its side
•The car skidded and overturned.
•~ sth He stood up quickly, overturning his chair.
2. transitive ~ sth 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 is not correct, and to make it no longer valid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.
Verb forms: 
Thesaurus:
overturn verb T
•Councillors overturned the decision.
reverse • • override • • overrule • • set sth aside • |written quash •
Opp: uphold
overturn/reverse/override/overrule/set aside/quash a decision
overturn/reverse/override/quash a ban
overturn/reverse/set aside/quash a conviction/verdict
Example Bank:
•She completely overturned my preconceptions about film stars.
•This argument seems convincing, but is easily overturned.
•He hopes that councillors will overturn the decision.
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