society > travel > transport > riding on horse (or other animal) > ride a horse (or other animal) [verb (intransitive)] > rein in (3)
transitive. To check or stop (a horse) by pulling at the reins. Also occasionally intransitive.
transitive. to draw bridle (also †to draw bit, to draw rein) and variants: to stop or slow one's horse by pulling at the reins; to pull up; (figur…
intransitive. U.S. Of a horse: to slacken its pace; to stop short, to pull up. Also of a rider: to rein in one's horse.