MELTDOWN
meltdown
(noun) a disaster comparable to a nuclear meltdown; “there is little likelihood of a meltdown comparable to the American banking collapse in March 1933”
meltdown, nuclear meltdown
(noun) severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping
Source: WordNet® 3.1
Etymology
Noun
meltdown (plural meltdowns)
Severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping.
A situation being likened to a nuclear meltdown; a crisis.
(figuratively) A tantrum.
Synonyms
• (tantrum): see tantrum
Source: Wiktionary