Definition of meltdown noun from the Oxford Advanced Learner's Dictionary

     

    meltdown

     noun
    noun
    BrE BrE//ˈmeltdaʊn//
     
    ; NAmE NAmE//ˈmeltdaʊn//
     
    [uncountable, countable]
     
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  1. 1a serious accident in which the central part of a nuclear reactor melts, causing harmful radiation to escape
  2. 2(economics) a situation where something fails or becomes weaker in a sudden or dramatic way The country is in economic meltdown. a meltdown on the New York Stock Exchange
See the Oxford Advanced American Dictionary entry: meltdown