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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Origin obscure, with a number of possible etymologies suggested: * a dialectal word, * a word related to the name of the now-forgotten inventor, * a derivation from French couvert (“covered”), although couvert is not used in this sense and the French translation of culvert is ponceau or buse de drainage, * a derivation from an unrecorded Dutch word, possibly *coul-vaart, a combination of Dutch coul-, from French couler (“to flow”), and Dutch vaart (“a trip by boat, a canal”).
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Classic usage
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