Meaning of “upheaval” in the English Dictionary

british dictionary

"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)