meltdown

This term describes a catastrophic failure of a system, whether biological, financial, or mechanical. When applied to human behavior, it carries a strong connotation of helplessness and total loss of regulation, often used in the context of young children or individuals under extreme sensory or emotional stress. It is more intense than a simple "tantrum," implying a complete psychological collapse.

In technical and economic contexts, the word evokes a sense of irreversible damage and rapid descent. A nuclear meltdown is a literal physical disaster, while a financial meltdown is a metaphorical extension of that same destructive energy, suggesting a systemic failure that cannot be easily stopped once it begins.