Thesaurus

(n) : a rigid implement, often roughly y-shaped, that is fixed to one's heel for purpose of prodding a horse. Often worn by, and emblematic of, the cowboy or the knight.^W; anything that inspires or motivates, as a spur does to a horse

(v) : to prod (esp. a horse) in the side or flank, with the intent to urge motion or haste, to gig; to urge or encourage to action, or to a more vigorous pursuit of an object; to incite; to stimulate; to instigate; to impel; to drive