To rob; also to break, beat out, or kill. I’ll mill your glaze; I’ll beat out your eye. To mill a bleating cheat; to kill a sheep. To mill a ken; to rob a house. To mill doll; to beat hemp in bridewell. Cant.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Mill * Mill LayNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes