JOCK'EY, noun [said to be from Jackey, a diminutive of Jack, John; primarily, a boy that rides horses.]
1. A man that rides horses in a race.
2. A dealer in horses; one who makes it his business to buy and sell horses for gain. Hence,
3. A cheat; one who deceives or takes undue advantage in trade.
JOCK'EY, verb transitive To cheat; to trick; to deceive in trade.
1. To jostle by riding against one.