A person who gets angry very easily and reacts without thinking, often causing problems through their quick temper.
Compound of 'hot' (from Old English 'hat,' literally warm) and 'head.' The metaphor of heat representing anger is ancient and appears across many languages.
The idea of heat meaning anger is so deeply built into language—we say 'hot under the collar,' 'burning mad,' 'inflamed'—and science backs this up because actual body temperature rises when you get angry!
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