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upheaval

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noun [countable/uncountable] British English pronunciation: upheaval /ʌpˈhiːv(ə)l/ 
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singularupheaval
pluralupheavals
  1. a sudden or violent change, especially one that affects people's lives

    Maya's been going through a period of emotional upheaval.

    political/social/economic upheaval

    There have been massive upheavals in the telecommunications industry.

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