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  1. Oxford Dictionary

    crack-up

    • n.
      an emotional breakdown；an act of breaking up or splitting apart

    • noun: crack-up, plural noun: crack-ups

    • 釋義

    名詞

    • 1. an emotional breakdown he appeared to be on the verge of a complete crack-up
    • 2. an act of breaking up or splitting apart the crack-up of the Soviet Union