Meaning of “meltdown” in the English Dictionary

(Definition of “meltdown” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"meltdown" in American English

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meltdownnoun [ C/U ]

us /ˈmeltˌdɑʊn/

a dangerous accident in which the fuel melts in a nuclear reactor (= device that produces energy)

(Definition of “meltdown” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"meltdown" in Business English

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meltdownnoun [ C or U ]

uk /ˈmeltdaʊn/ us

ECONOMICS, FINANCE a situation in which an industry, economy, etc. is badly affected by a lot of problems within a short period of time:

Analysts were watching for signs of a meltdown following problems at three of Wall Street's major investment banks.
A deadly new computer virus caused much of the internet to go into meltdown last weekend.
a meltdown in sth A meltdown in the mortgage industry has made it more difficult to get a loan or to refinance.
a meltdown of sth The two officials are expected to help develop a plan to prevent a meltdown of the county's finances.
be in meltdown Since the credit crisis, the whole banking industry has been in meltdown.

(Definition of “meltdown” from the Cambridge Business English Dictionary © Cambridge University Press)