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English definition of “upheaval”

upheaval

noun [C or U]     /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 . It would cause a tremendous upheaval to install a different computer system .Social order and disorder
(Definition of upheaval noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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