Spur

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.

Anything that inspires or motivates, as a spur does to a horse.

An appendage or spike pointing rearward, near the foot, for instance that of a rooster.

Any protruding part connected at one end, for instance a highway that extends from another highway into a city.

Roots, tree roots.

To prod (especially 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.

To put spurs on; as, a spurred boot.