EASY,
facile, supple, pliable, mnageable. As make the Cull easy; Gagg him, tht he may make no Noise;sometimes used for murdering a Person robbed, for fear of Discovery.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Easy in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).