History
History
History
UK
US
Meaning:

one of a pair of sharp-toothed wheels on the heels of a rider's boots, used to make the horse go faster

incitement, stimulus

activation actuation catalyst excitant goad goose impetus impulse incentive incitation inducement motivation motive needle prick stimulant trigger turn-on urge
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SPUR as in Wiktionary
SPUR as in Wikipedia