To blacken or make black; to darken with coal dust or soot; an archaic or dialectal variant of 'colly.'
Dialectal variant of 'colly,' from Middle English, relating to coal or soot; the '-ow' ending is characteristic of some English regional variations.
In old English dialects, miners and factory workers were said to be 'collowed' with coal dust—the word captures how completely the black soot would cover someone!
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