Jockey (noun)

1. A horse-racing rider.
2. A person who operates or rides something, especially a machine, vehicle, or aircraft.
3. A person who manipulates or manages something skilfully or for their own advantage.

Origin:

Late 16th century: from the proper name jock, a nickname for john.

Examples:

1. The jockey rode his horse to victory.
2. The pilot was a skilled jockey of the aircraft.
3. She was a jockey of the stock market, making clever investments.
4. The jockey controlled the speed of the race car.
5. The jockey expertly guided the boat through the rough water.