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I will knock out two of your eight eyes; a common Billingsgate threat from one fish nymph to another: every woman, according to the naturalists of that society, having eight eyes; viz. two seeing eyes, two bub-eyes, a bell-eye, two pope’s eyes, and a ***-eye. He has fallen down and trod upon his eye; said of one who has a black eye.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
To Edge * Elbow GreaseNathan 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.