From WordNet (r) 3.0 (2006) [wn]:
jockey
n 1: someone employed to ride horses in horse races
2: an operator of some vehicle or machine or apparatus; "he's a
truck jockey"; "a computer jockey"; "a disc jockey"
v 1: defeat someone through trickery or deceit [syn: cheat,
chouse, shaft, screw, chicane, jockey]
2: compete (for an advantage or a position)
3: ride a racehorse as a professional jockey
From The Collaborative International Dictionary of English v.0.48 [gcide]:
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]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Jockey \Jock"ey\, v. t. [imp. & p. p. Jockeyed; p. pr. & vb.
n. Jockeying.]
1. " To jostle by riding against one." --Johnson.
[1913 Webster]
2. To play the jockey toward; to cheat; to trick; to impose
upon in trade; as, to jockey a customer.
[1913 Webster]
3. To maneuver; to move in an intricate manner so as to avoid
obstacles; as, to jockey a large cabinet up a winding
staircase.
[PJC]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Jockey \Jock"ey\, v. i.
1. To play or act the jockey; to cheat.
[1913 Webster]
2. To maneuver oneself aggressivley or skillfully so as to
achieve an advantage; as, he jockeyed himself into
position to be noticed.
[PJC]