quicken Antonyms

reduce speed unnerve unman tucker suppress slow slacken sap retund retard restrain repress reefed quench weaken slack off cause death slacks put the brakes on slow up drag out hold up turn off put back kayo slow down hold off hold back decelerate put-off procrastinate disedge discourage disappoint depress demoralize delay defer deaden daunt dampen crush cow check dishearten dismay postpone overlap outstretch obstruct