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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
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Francis Grose was independently wealthy, having inherited money from his father, a jeweller. Finding himself overspending, he published a number of books; his Provincial Glossary seems to have been the starting-point for the Vulgar Tongue reproduced here.