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A jocular name, or term of reproach, to one who stops the circulation of the glass by preaching over his liquor; as it is said was done by a parson of that name whose cellar was under his pulpit.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Parson’s Journeyman * PartialNathan 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.