An archaic or dialectal term whose exact meaning is uncertain, possibly a variant or corruption of another word.
The etymology is highly uncertain; it may be a variant spelling of another word, a dialectal term from regional English, or even a scribal error in historical texts that became recorded as a word.
Sometimes words in old dictionaries are just mistakes—a scribe misspelled something, it got copied into a reference text, and now we have 'beveto' as an official but meaningless entry! Dictionaries are full of these ghosts.
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