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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English clough, clow, cloȝ, from Old English *clōh, from Proto-West Germanic *klą̄h (“cleft, sluice, abyss”), of uncertain origin, possibly ultimately from Proto-Indo-European *gel- (“to form into a ball”). Cognate with Scots cleuch (“gorge; ravine”), Old High German klāh (in placenames), Old High German klingo, klinga (“brook, cataract, gulf, rapids”). Perhaps conflated or influenced by Old Norse klofi (“a cleft or rift in a hill, ravine”); compare Dutch kloof (“a slit, crevice, chink”). See also cling, clove.
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Classic usage
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