Noun meltdown has 2 senses
  1. meltdown, nuclear meltdown - severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping
    --1 is a kind of overheating
  2. meltdown - a disaster comparable to a nuclear meltdown; "there is little likelihood of a meltdown comparable to the American banking collapse in March 1933"
    --2 is a kind of
    calamity, catastrophe, disaster, tragedy, cataclysm
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