upheaval definition, meaning - what is upheaval in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “upheaval”

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upheaval

noun [C or U] uk   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. It would cause a tremendous upheaval to install a different computer system.
(Definition of upheaval from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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