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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Inherited from Middle English buttok, probably from Old English buttuc (“end; end piece”; also, “short piece of land”). Attested with its current anatomical meaning since 1300. A diminutive form of what is presumably the Old English precursor of butt + -ock (diminutive suffix).
cheek
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Classic usage
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