An archaic or dialectal term meaning to buy or barter; to make a purchase or trade.
From Middle English coffen or cofen, possibly related to Old Norse kaup (bargain) or similar Germanic roots meaning purchase or exchange. The word is rarely used in modern English except in historical or regional dialects.
Coff is the kind of word that makes you realize English once had dozens of synonyms for 'buy' that have almost completely vanished. Regional British dialects might still use it, but you're far more likely to encounter it in medieval literature than anywhere else.
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