To make dirty or smear with filth; to cover something with clarts (mud or mire).
From 'be-' combined with 'clart' (a Northern and Scottish English dialect word for mud, dirt, or filth), creating a verb meaning to coat with mud or make muddy.
Regional dialect words like 'clart' were much more integrated into standard English during the medieval period—this word beautifully preserves that Northern English vocabulary before standard London English dominated.
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