1. (n.) The strap of a bridle by which the rider controls a horse\.

2. (n.) Hence, an instrument or means of curbing, restraining, or governing; government; restraint.

3. (v. t.) To govern or direct with the reins; as, to rein a horse one way or another.

4. (v. t.) To restrain; to control; to check.

5. (v. i.) To be guided by reins.

administration arrest arrestation backpedal backwater brake bridle check clip the wings collect command constrain constraint contain control cool cool off cooling cooling down cooling off curb curtail curtailment decelerate deceleration delay detain dompt draw rein ease off ease up enjoin govern guard harness helm hinder hindrance hold hold at bay hold back hold fast hold in hold in check hold in leash hold up impede inhibit inhibition injunction interdict keep keep back keep from keep in keep in check keep under control lay under restraint leadership legal restraint let down let up limit limitation lose ground lose momentum lose speed moderate monopoly obstruct power prohibit prohibition protection protectionism protective tariff pull pull in rationing reef rein in reins relax repress restrain restraint restraint of trade restrict retard retardation retrench retrenchment rule running self-control set back simmer down slack off slack up slacken slow slow down slow up slowing down smother snub stay straiten suppress take in sail tariff wall thought control throttle down tiller withhold