1736 Canting Dictionary / UV / VINEGAR [thing,person]
a Cloak; also the Fellow that makes a Ring, and keeps Order amongst Wrestlers, Dudgel-Players, &c.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Vinegar in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).