spin
 v.— «“Spinning” is the racetrack term for maneuvering by which agents change mounts shortly before entries are taken, or trainers change riders.» —“Jockey Agents Always On Alert ‘Spinning’ Causes Backstretch Agony” by Bob Fortus New Orleans Times-Picayune (La.) Dec. 23, 1999. (source: Double-Tongued Dictionary)