meltdown

noun
melt*down \ ˈmelt-ˌdau̇n \
1956{ds||1||}
  • the accidental melting of the core of a nuclear reactor
  • a rapid or disastrous decline or collapse
  • a breakdown of self-control (as from fatigue or overstimulation)

melt down

verb
melt down \
1620{ds|t|||}
  • to undergo an accidental melting of the core
  • to experience a very fast collapse or failure
  • to melt (something) so that it can be used for another purpose
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