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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From hot + head. Compare English hotbrain (“a hothead”); Middle English hot-heorte, hat-heorte (“anger”), Old English hātheort (“furious, angry, irascible, passionate, ardent”, literally “hot-heart”).
fire-eater
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tap / space
Classic usage
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