to cover with foam or froth; to cause to foam.
From 'be-' plus 'foam,' from Old English 'fam.' This verb describes coating something in foam or causing foam to cover it.
Archaic texts describe waves that 'befoam' the shore or horses that 'befoam' from exertion—it's a vivid way to say something is completely covered in foam, suggesting violence or intensity.
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