n. 25B6; noun
competition can be a spur : STIMULUS, incentive, encouragement, inducement, fillip, impetus, prod, motivation, inspiration; informal kick up the backside, shot in the arm.
a spur of bone : PROJECTION, spike, point; technical process.
disincentive, discouragement.
25B6; verb the thought spurred him into action : STIMULATE, encourage, prompt, propel, prod, induce, impel, motivate, move, galvanize, inspire, incentivize, urge, drive, egg on, stir; incite, goad, provoke, prick, sting; N. Amer. light a fire under.
discourage.
25A0; on the spur of the moment IMPULSIVELY, on impulse, impetuously, without thinking, without premeditation, unpremeditatedly, impromptu, extempore, spontaneously; informal off the cuff.