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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Mostly likely a back-etymology of pot, to form crack + pot. Originally, from crack + pate. Compare typologically Russian чо́кнутый (čóknutyj) (< чо́каться (čókatʹsja), onomatopoeic), see crack for the further typology.
crank, nut, nut case, fruitcake, screwball
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Classic usage
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