meltdown
melt·down [meltdown meltdowns] BrE [ˈmeltdaʊn] NAmE [ˈmeltdaʊn] noun uncountable, countable
1. a serious accident in which the central part of a nuclear ↑reactor melts, causing harmful ↑radiation to escape
2. (economics)a situation where sth fails or becomes weaker in a sudden or dramatic way
•The country is in economic meltdown.
•a meltdown on the New York Stock Exchange
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