1736 Canting Dictionary / S / To SNILCH [v]
to eye or see any Body. The Cull snilches; the Man eyes or sees you.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
To Snilch in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).