Definition of upheaval noun from the Oxford Advanced Learner's Dictionary

 

upheaval

 noun
noun
BrE BrE//ʌpˈhiːvl//
 
; NAmE NAmE//ʌpˈhiːvl//
 
[countable, uncountable]
 
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a big change that causes a lot of confusion, worry and problems synonym disruption the latest upheavals in the education system I can't face the upheaval of moving house again. a period of emotional upheavalExtra examples The company underwent a massive upheaval after the takeover. The loss of his high-paying job caused enormous domestic upheaval. I can’t face the upheaval of moving house again. Teachers are still getting used to the latest upheavals in the education system. The country has undergone a major political upheaval.
See the Oxford Advanced American Dictionary entry: upheaval