Blackleg

Definition and stakes

John Camden Hotten,  The slang dictionary

“ Blackleg, a rascal, swindler, or card cheat. The derivation of this term was solemnly argued before the full Court of Queen’s Bench upon a motion for a new trial for libel, but was not decided by the learned tribunal. Probably it is from the custom of sporting and turf men wearing black top-boots. Hence BLACKLEG came to be the phrase for a professional sporting man, and thence for a professional sporting cheat. The word is now in its worst sense diminished to “leg.”
Black Maria, the sombre van in which prisoners are conveyed from the police court to prison.
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Source: Gutenberg

Trench H. Johnson,  Phrases and Names, Their Origins and Meanings

“ In the district of Blackfriars stood the great monastery.
Blackguards. A derisive nickname given originally to the scullions of the Royal Household, touching their grimy appearance, as contrasted with the spruceness of the Guards of Honour.
35Blackheath. A corruption of Bleak Heath.
Blackleg. After sporting men of a low type, who invariably wore black gaiters or top-boots.
Blackmail. Originally a tax or tribute paid to robbers or freebooters as a compromise for protection. “Black” implied the Gaelic for security, while mal was Anglo-Saxon for tribute.
Black Maria. Slang for a prison van.
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Source: Gutenberg

Portrait of William Le Queux William Le Queux,  This House to Let

“ Miss Keane shrugged her shoulders. “She is a little bit hysterical, you know. One moment, she vows she will shut up the flat and go abroad, for fear of the nasty things that people will say. The next moment, she says that, confident in her perfect innocence, she will stay and face the music, and give her parties as usual.”
“Has she asked your advice?” queried Spencer.
“She has, and my advice is to go on as usual. It is not her fault that blacklegs have crept into her circle. They creep into the best houses, the best clubs. So long as this curséd gambling goes on, there will be sharpers.”
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Source: Gutenberg

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