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Sharpers, who, during the drawing of the lottery, wait ready mounted near Guildhall, and, as soon as the first two or three numbers are drawn, which they receive from a confederate on a card, ride with them full speed to some distant insurance office, before fixed on, where there is another of the gang, commonly a decent looking woman, who takes care to be at the office before the hour of drawing: to her he secretly gives the number, which she insures for a considerable sum: thus biting the biter.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Pigeon * Pigeon’s MilkNathan 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.