Definitions from Wiktionary ( )

▸ noun:  Severe overheating of the core of a nuclear reactor resulting in the core melting and potentially in radiation escaping.
▸ noun:  A situation being likened to a nuclear meltdown; a crisis.
▸ noun:  (informal) A tantrum or emotional outburst.
▸ noun:  (psychology) An autistic response to stress or sensory overload, in which the person is overwhelmed by intense, seemingly disproportionate emotions, behaving erratically and becoming unable to mask.

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