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.
n Any protruding part connected at one end, for instance a highway that extends from another highway into a city.
v To prod (especially a horse) in the side or flank, with the intent to urge motion or haste, to gig.
v 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.