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upheaval

noun [C or U]
 
 
/ʌpˈhiː.vəl/

Definition

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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