Definition of upheaval noun from the Oxford Advanced American Dictionary

     

    upheaval

     noun
    noun
    NAmE//ʌpˈhivl//
     
    [countable, uncountable]
     
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  1. 1a big change that causes a lot of confusion, worry, and problems synonym
  2. 2 the latest upheavals in the education system I can't face the upheaval of moving house again. a period of emotional upheaval
See the Oxford Advanced Learner's Dictionary entry: upheaval