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A soldier who, as the term is, sings out at the halberts. It is a point of honour in some regiments, among the grenadiers, never to cry out, become nightingales, whilst under the discipline of the cat of nine tails; to avoid which, they chew a bullet.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Night Magistrate * NightmanNathan 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.