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Classic usage
Reading level: hard
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English sluse, alteration of scluse, from Anglo-Norman escluse (“sluice, floodgate”), from Late Latin exclusa (“extrusion, gate”), from Latin exclūsus, form of exclūdō (“to shut out, to exclude”) (English exclude). Cognate to Dutch sluis.
sluiceway, penstock
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Classic usage
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