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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 bulloin, bullioun, from Anglo-Norman bullion, of obscure origin, perhaps from French bouillon, extending the sense to that of ‘melting’. Middle Dutch boelioen (“base metal”) seems to have come from the unrelated French billon.
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Classic usage
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