What does the word spur mean?

Usage examples for spur

  1. He caught sight of the long black military boot and silver spur, and half- recognized the up- and- down movement of the crossed leg long before he reached the tent. – Rung Ho! by Talbot Mundy
  2. Necessity will in future more and more spur them on; for the ground, cleared of wood, must be cultivated, or the farm loses its value; there is no waiting for food till another generation of pines be grown to maturity. – Letters written during a short residence in Sweden, Norway, and Denmark by Mary Wollstonecraft
  3. For answer the girl drove her spur into her mount's side. – The Mad King by Edgar Rice Burroughs