noun A device with a small spike or a spiked wheel that is worn on a rider's heel and used for urging a horse forward. A thing that prompts or encourages someone; an incentive. (profit was both the spur and the reward of enterprise) A projection from a mountain or mountain range.
verb Urge (a horse) forward by digging one's spurs into its sides. (she spurred her horse towards the hedge) Give an incentive or encouragement to (someone) (her sons' passion for computer games spurred her on to set up a software business) Prune in (a side shoot of a plant) so as to form a spur close to the stem. (spur back the lateral shoots)