An archaic or dialectal form meaning to cover, affect, or change something completely (likely a variant or corruption of begin or another be- form).
Possibly a variant or dialectal form of begin, or an independent be- verb formation meaning 'to go about' or 'to affect.' Etymology is uncertain due to its rare usage.
Words like 'bego' with unclear histories remind us that many historical English words were used so rarely or regionally that we may never fully understand them—they're like linguistic mysteries waiting to be solved.
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