Longman Dictionary of Contemporary English homepage

overturn

verb
     
Related topics: Government
o‧ver‧turn
1 [intransitive and transitive] if you overturn something, or if it overturns, it turns upside down or falls over on its side:
Leslie jumped to her feet, overturning her chair.
His car overturned, trapping him inside.
2

overturn a decision/verdict etc

to change a decision or result so that it becomes the opposite of what it was before:
His conviction was overturned by the Court of Appeal.
3 [transitive]PMPG to suddenly remove a government from power, especially by using violence [= overthrow]

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