Jockey \Jock"ey\, n.; pl. {Jockeys}. [Dim. of Jack, Scot. Jock; orig., a boy who rides horses. See 2d {Jack}.] [1913 Webster] 1. A professional rider of horses in races. --Addison. [1913 Webster] 2. A dealer in horses; a horse trader. --Macaulay. [1913 Webster] 3. A cheat; one given to sharp practice in trade. [1913 Webster]