To dye or stain something a deep red or crimson color; to make something red with blood.
From 'be-' combined with 'crimson' (from Old Spanish cramoisi, from Arabic). In medieval and Renaissance literature, this verb was used poetically to describe bloodstains or dying cloth.
Shakespeare and other playwrights loved 'becrimson'—it's far more dramatic than 'stain red.' When they wrote of battles where swords 'becrimson the field,' it's vivid and violent. The prefix 'be-' made verbs more emphatic and poetic, which is why poets kept using them long after everyday speech abandoned them.
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