1736 Canting Dictionary / S / SHAVER [rogue]
A cunning Shaver; A subtle, smart Fellow. He shaves close; He gripes, squeezes, or extorts very severely.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Shaver in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).