Cambridge Advanced Learner's Dictionary
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Definition
upheaval noun
/ʌpˈhiː.vəl/ n [C or U]
(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.
It would cause a tremendous upheaval to install a different computer system.
(Definition of upheaval noun from the Cambridge Advanced Learner's Dictionary)
