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To cheat, or trick: also to insult: he thought to have topped upon me. Top; the signal among taylors for snuffing the candles: he who last pronounces that word word, is obliged to get up and perform the operation.— to be topped; to be hanged. The cove was topped for smashing queerscreens; he was hanged for uttering forged bank notes.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Top Ropes * Top DiverNathan 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.