(n.) Hence, an instrument or means of curbing, restraining, or governing; government; restraint.
(n.) The strap of a bridle, fastened to the curb or snaffle on each side, by which the rider or driver governs the horse.
(v. i.) To be guided by reins.
(v. t.) To govern or direct with the reins; as, to rein a horse one way or another.
(v. t.) To restrain; to control; to check.