Possible Definitions:
1. Jockey (n.) A professional rider of horses in races.
2. Jockey (n.) A dealer in horses; a horse trader.
3. Jockey (n.) A cheat; one given to sharp practice in trade.
4. Jockey (v. t.) " To jostle by riding against one."
5. Jockey (v. t.) To play the jockey toward; to cheat; to trick; to impose upon in trade; as, to jockey a customer.
6. Jockey (v. i.) To play or act the jockey; to cheat.