BULLY,
a supposed Husband to a Bawd, or Whore; also a huffing Fellow, a pretended Bravo, but a Coward at the Bottom.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
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Bully in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).