welsher

Would you yourself, if you had chased a pickpocket or a welsher for half a mile, mistake his identity five minutes afterwards?

Does the reader know what is a “welsher”—the creature against whose malpractices the sporting public are so emphatically warned?

The boy hung his head, but looked sulky rather than thankful for his brother's interference with himself and the welsher.

"Why, it is a fleecing of one," retorted the welsher savagely, even amid his successes.

He knows every rook and welsher and every swell magsman, and all their haunts and habits.