JANIZARIES,
the Mob, sometimes so called, and Bailiffs, Serjeants-Followers, yeomen, Setters, and any lewd Gang depending upon others.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
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Janizaries in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).