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A nose. How fares your old trunk? does your nose still stand fast? an allusion to the proboscis or trunk of an elephant. To shove a trunk: to introduce one’s self unasked into any place or company. Trunk-maker like; more noise than work.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Trundlers * Trusty TrojanNathan 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.