keep tight rein on

constrain contain control hamper hinder impede inhibit restrain suppress tame

abstain bit bridle check deny fetter hobble hog-tie hold down ice leash manacle moderate muzzle refrain retard scrub shackle subdue tie withhold

bottle up box in bring to screeching halt cool down cool off entrammel hold back hold in keep lid on rein in send up tie up

advance aid allow assist encourage facilitate forward free help let go permit promote release

go ahead incite indulge liberate loose loosen

foster