Dictionary entry

Jockey

Webster's Dictionary 1913

Jock″ey (?), n.; pl.Jockeys (#). [Dim. of Jack, Scot. Jock; orig., a boy who rides horses. See 2d Jack.]

1. A professional rider of horses in races. Addison.

2. A dealer in horses; a horse trader. Macaulay.

3. A cheat; one given to sharp practice in trade.