Wiktionary
blacklegs
n. (plural of blackleg English)
Wikipedia
Blacklegs (horse)
Blacklegs (foaled 1728) was a British Thoroughbred racehorse and sire who was the champion sire of Great Britain in 1746. He was bred by William Cavendish, 2nd Duke of Devonshire, and owned by his son William Cavendish, 3rd Duke of Devonshire.
Usage examples of "blacklegs".
I wish to so alter it as to put a premium on intelligence and character, and close the jury box against idiots, blacklegs, and people who do not read newspapers.
I was introduced to the blacklegs in your bar-room, and by a scamp who was a habitual lounger here.
He consorted much with blacklegs and such-like because blacklegs were to his taste.