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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English frouncen, from Old French froncir "to wrinkle, frown", from Frankish *hrunkiju (“a wrinkle”), from Proto-Germanic *hrunkijō, *hrunkitō (“fold, wrinkle”), from Proto-Indo-European *(s)ker- (“to turn, bend”). Akin to Old High German runza "fold, wrinkle, crease" (German Runzel "wrinkle"), Middle Dutch ronse "frown", Old Norse hrukka "wrinkle, crease" (Icelandic hrukka "wrinkle, crease, ruck"). More at ruck₂.
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Classic usage
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