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English definition of “overturn”

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overturn

verb uk   /ˌəʊ.vəˈtɜːn/ us    /ˌoʊ.vɚˈtɝːn/

overturn verb (GO UPSIDE DOWN)

[I or T] to (cause to) turn over: The car skidded off the road, hit a tree and overturned. The burglars had overturned all the furniture in the house.
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overturn verb (CHANGE)

[T] formal to change a legal decision: The Court of Appeal overturned the earlier decision. [T] UK If you overturn someone's majority in an election in the UK, you defeat them: The Labour candidate unexpectedly overturned the long-standing Tory majority.
(Definition of overturn from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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