Silver. Witcher bubber; a silver bowl. Witcher tilter; a silver-hilted sword. Witcher cully; a silversmith.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Wit * To WobbleNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes