meltdown

1 ENTRIES FOUND:
meltdown /ˈmɛltˌdaʊn/ noun
plural meltdowns
meltdown
/ˈmɛltˌdaʊn/
noun
plural meltdowns
Britannica Dictionary definition of MELTDOWN
1 
: an accident in which the core of a nuclear reactor melts and releases radiation
[count]
[noncount]
2 
a  : a very fast collapse or failure
[count]
[noncount]
b  [count] chiefly US, somewhat informal : a very fast loss of emotional self-control
— see also melt down at 1melt