BOB半岛

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        cave in

         
        See:
        cave
        part of speech: phrase
        inflections: caves in, caving in, caved in
        definition 1: to fall in or sink in.
        The walls of the old shed caved in.
        similar words:
        collapse
        definition 2: (informal) to give in or not resist.
        He caved in to his friend's demands.