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meltdown

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meltdown/ˈmɛltˌdaʊn/noun
pluralmeltdowns
meltdown
/ˈmɛltˌdaʊn/
noun
pluralmeltdowns
Learner's definition of MELTDOWN  
: an accident in which the core of a nuclear reactor melts and releases radiation
[count]
[noncount]
: a very fast collapse or failure
[count]
[noncount]
   b  [count]chiefly US, somewhat informal  : a very fast loss of emotional self-control
— see also melt down at 1melt
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