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

meltdown

noun
 
/ˈmeltdaʊn/
 
/ˈmeltdaʊn/
[uncountable, countable]
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  1. a serious accident in which the central part of a nuclear reactor melts, causing harmful radiation to escape
  2. (economics) a situation where something fails or becomes weaker in a sudden or dramatic way
    • in meltdown The country is in economic meltdown.
    • a meltdown on the New York Stock Exchange
    Topics Difficulty and failurec2
  3. (informal) a situation in which somebody becomes very upset and cannot control their behaviour
    • The toddler had a total meltdown when her mum said she had to leave the playground.
    Topics Feelingsc2
See meltdown in the Oxford Advanced American Dictionary
alloy
noun
 
 
From the Topic
Physics and chemistry
C2
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