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Choak away, the churchyard’s near; a jocular saying to a person taken with a violent fit of coughing, or who has swallowed any thing, as it is called the wrong way; Choak, chicken, more are hatching: a like consolation.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Chiving Lay * Choak PearNathan 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.