The Collaborative International Dictionary of English v.0.48:

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]

The Collaborative International Dictionary of English v.0.48:

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]

The Collaborative International Dictionary of English v.0.48:

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]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

80 Moby Thesaurus words for "jockey":
   Jehu, angle, beguile, bellyband, broncobuster, buckaroo, caballero,
   cavalier, cavalryman, challenge, chevalier, cinch, circus rider,
   compete, compete with, contrive, cope, cowboy, cowgirl, cowpuncher,
   emulate, engineer, equestrian, equestrienne, exploit, finagle,
   finesse, flier, gaucho, gerrymander, girt, girth, goer,
   hell-driver, horn, horse racer, horse soldier, horseback rider,
   horsebacker, horseman, horsewoman, hummer, hustler, intrigue,
   knight, machinate, maneuver, manipulate, meet, mounted policeman,
   outvie, play, play games, plot, pommel, postboy, postilion,
   pull strings, puncher, racer, rider, rival, roughrider, runner,
   scheme, scorcher, sizzler, speed demon, speeder, steeplechaser,
   stepper, stirrup, surcingle, test one another, trick rider,
   turfman, vaquero, vie, vie with, wangle