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Classic usage
Reading level: hard
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From or akin to West Frisian ril (“rill; a narrow channel”), Dutch ril (“rill; gully; trench; watercourse”), German Low German Rille, Rill (“a small channel; brook; furrow”), German Rille (“a groove; furrow”).
rivulet, run, runnel, streamlet
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Classic usage
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