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Meaning of “upheaval” in the English Dictionary

"upheaval" in British English

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upheavalnoun [C or U]

uk   /ʌpˈhiː.vəl/  us   /ʌpˈhiː.vəl/
a great change, especially causing or involving much difficulty, activity, or trouble: Yesterday's coup brought further upheaval to a country already struggling with famine. I'm not sure it's worth the upheaval of moving to gain just a little more space.
(Definition of upheaval from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"upheaval" in American English

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upheavalnoun [C/U]

 us   /ˌʌpˈhi·vəl/
(a) great change, causing or involving difficulty or trouble: [U] The long garbage strike in 1970 caused much political upheaval.
(Definition of upheaval from the Cambridge Academic Content Dictionary © Cambridge University Press)
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