An archaic term possibly referring to going beside or bypassing something; the meaning is unclear in modern English.
Likely combining 'by' (beside) with 'ganging' (the present participle of 'gang,' an archaic verb meaning 'to go'). The exact meaning has become obscured over time.
Words like 'byganging' that appear in no modern dictionary are linguistic fossils—they survive in old texts but their meanings died when the people who used them stopped talking.
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