A person who washes or processes buck hides and skins, or a device used in the hide-washing process.
From 'buckwash' plus the agent suffix '-er,' creating a noun for someone who performs the buckwashing. This occupational term would have been used in tanneries and hide-processing operations.
Medieval and early modern tanneries had entire teams with specialized roles—the buckwasher was essential because properly washing hides before tanning determined whether the final leather would be usable or ruined.
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