spurs

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

block deterrent discouragement hindrance prevention

curb

arouse drive propel push spark stimulate stir trigger

animate awaken countenance exhort favor goad goose impel instigate press prick prod rally rouse sic urge

egg on fire up key up put up to turn on work up

calm check discourage dissuade halt repress stop

deaden

disapprove