1736 Canting Dictionary / R / RUFF [punishment]
an old-fashioned double Band; from whence the Pillory is called, The Wooden Ruff.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Ruff in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).