Definition of overturn verb from the Oxford Advanced Learner's Dictionary

     

    overturn

     verb
    verb
    BrE BrE//ˌəʊvəˈtɜːn//
     
    ; NAmE NAmE//ˌoʊvərˈtɜːrn//
     
    Verb Forms present simple I / you / we / they overturn
    BrE BrE//ˌəʊvəˈtɜːn//
     
    ; NAmE NAmE//ˌoʊvərˈtɜːrn//
     
    he / she / it overturns
    BrE BrE//ˌəʊvəˈtɜːnz//
     
    ; NAmE NAmE//ˌoʊvərˈtɜːrnz//
     
    past simple overturned
    BrE BrE//ˌəʊvəˈtɜːnd//
     
    ; NAmE NAmE//ˌoʊvərˈtɜːrnd//
     
    past participle overturned
    BrE BrE//ˌəʊvəˈtɜːnd//
     
    ; NAmE NAmE//ˌoʊvərˈtɜːrnd//
     
    -ing form overturning
    BrE BrE//ˌəʊvəˈtɜːnɪŋ//
     
    ; NAmE NAmE//ˌoʊvərˈtɜːrnɪŋ//
     
    Legal processes
     
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  1. 1[intransitive, transitive] if something overturns, or if somebody overturns it, it turns upside down or on its side The car skidded and overturned. overturn something He stood up quickly, overturning his chair.
  2. 2[transitive] overturn something 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 is not correct, and to make it no longer valid to overturn a decision/conviction/verdict His sentence was overturned by the appeal court. See related entries: Legal processes
  3. Extra examples She completely overturned my preconceptions about film stars. This argument seems convincing, but is easily overturned. He hopes that councillors will overturn the decision.
See the Oxford Advanced American Dictionary entry: overturn