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  • noun
    plural -als
    a major change or period of change that causes a lot of conflict, confusion, anger, etc. [noncount]
    The civil rights movement marked a period of social upheaval in the U.S.
    the emotional upheaval of divorce [count]
    technical :an occurrence in which a part of the Earth's surface moves up forcefully [count]
    The island was created by an upheaval of the ocean floor. [noncount]
    The lake was formed by geologic upheaval.