To make something lucky or to grant good fortune to something; an archaic term meaning to bless with luck.
From be- + gluc (from Old English/Germanic luck-related words, possibly from Middle Low German gluck). This is an extremely rare and archaic formation, possibly a nonce word or very limited dialect usage.
This word is so obscure it barely appears in any historical records—it's the kind of word that shows how the be- prefix could theoretically attach to almost anything, and sometimes speakers just experimented with it, creating words that never caught on enough to survive into modern English.
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