a pointed or wheel-shaped metal device secured to the heel of a rider's boot and used to prick the horse's flank in order to urge it on
a goad to action; a stimulus or incentive
Natural concupiscence seemeth as a spur to marriage — Bacon
something projecting like or suggesting a spur, e.g.:
a projecting root or branch of a tree
a fruit-bearing side shoot
a ridge that extends sideways from a mountain or range of mountains
a tubular projection of a plant flower head, e.g. in some orchids, often containing nectar
a metal spike fitted to a fighting cock's leg
a short length of road or railway connecting with a major one
a ridge that extends sideways from a mountain or range of mountains
a support for ceramic products in a kiln
a protective wall or jetty built out from a riverbank or seashore; = groyne
suddenly; on impulse
to prove oneself or become recognized as competent in some activity
Pocock won his spurs as a slave-driver — Jack London
[from the medieval chivalric tradition of acquiring spurs on achieving knighthood]