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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Borrowed from French rideau (“curtain”), from Middle French rideau, from Old French ridel (“plaited stuff; cloth curtain; blind”), from rider (“to plait; to wrinkle”), perhaps from Old High German ridil (“a headband; a ribbon”) or rīdan, wrīdan (“to wrinkle”) (related to English writhe), from Proto-Germanic *wriþilaz, from *wrīþaną (“to twist, wind, wrap”). See more at riddle (“curtain”), writhe.
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Classic usage
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