An archaic or dialectal form meaning to make blue or to dye something blue.
Derived from the verb 'blue' with the prefix 'be-', a common Old English construction that intensified or modified verbs. This pattern created hundreds of now-obsolete words.
The 'be-' prefix was incredibly productive in Middle English—speakers could slap it on almost any adjective to create a verb, which is why we have 'belabor' and 'besmirch' today, but 'belue' didn't survive.
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