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WordReference Random House Learner's Dictionary of American English © 2024melt•down /ˈmɛltˌdaʊn/USA pronunciation n. [countable]- Physics, Energythe melting of the core of a nuclear reactor, due to inadequate cooling of the fuel elements.
- any quickly developing breakdown, mishap, or accident.
WordReference Random House Unabridged Dictionary of American English © 2024melt•down (melt′doun′),USA pronunciation n. - Physics, Energythe melting of a significant portion of a nuclear-reactor core due to inadequate cooling of the fuel elements, a condition that could lead to the escape of radiation.
- noun, nominal use of verb, verbal phrase melt down 1960–65
Collins Concise English Dictionary © HarperCollins Publishers:: meltdown /ˈmɛltˌdaʊn/ n - (in a nuclear reactor) the melting of the fuel rods as a result of a defect in the cooling system, with the possible escape of radiation into the environment
- informal a sudden disastrous failure with potential for widespread harm, as a stock-exchange crash
- informal the process or state of irreversible breakdown or decline: the community is slowly going into meltdown
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