A worker employed in secondary or supplementary work, not in the main occupation or trade of a guild or enterprise.
Combining 'bye' (secondary, additional) with 'worker,' referring to laborers who did supporting work rather than the primary skilled craft.
Medieval guilds strictly controlled who could do main work, so 'byeworkers' formed an underclass doing crucial but unregulated tasks—a historical reminder that every successful system has an exploited layer underneath.
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