Meaning of “upheaval” in the English Dictionary

british 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)