Extremely angry or furious, suggesting anger so intense it feels like it's bubbling over. The phrase emphasizes the heat and intensity of the emotional state.
This metaphor draws from the physical process of water reaching its boiling point at 212°F, where it transforms from liquid to steam in a violent, bubbling reaction. The comparison between emotional intensity and the heat of boiling water dates back centuries in English.
The phrase captures not just the intensity but the instability of extreme anger - just as boiling water is constantly in motion and can easily spill over, someone who's 'boiling mad' is on the verge of an emotional overflow. Different cultures have similar heat-based anger metaphors, suggesting this connection between temperature and emotion is nearly universal.
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