jockey

Short definition from Wiktionary

Noun

1. 1
   One who rides racehorses competitively.
2. 2
   That part of a variable resistor or potentiometer that rides over the resistance wire
3. 3
   An operator of some machinery or apparatus.
4. 4
   A dealer in horses; a horse trader.
5. 5
   A cheat; one given to sharp practice in trade.
6. 6
   A prostitute's client.
7. 7
   A rapist.

Verb

1. 1
   To ride (a horse) in a race.
2. 2
   To jostle by riding against.
3. 3
   To maneuver (something) by skill; especially, to do so for one's advantage.
4. 4
   To cheat or trick.