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Persons who gamble in Exchange Alley, by pretending to buy and sell the public funds, but in reality only betting that they will be at a certain price, at a particular time; possessing neither the stock pretended to be sold, nor money sufficient to make good the payments for which they contract: these gentlemen are known under the different appellations of bulls, bears, and lame ducks.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Stock Drawers * Stomach WormNathan 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.