Definitions
1.NounA strap or rope attached to a bridle or bit, used to control a horse, other animal or young child.
2.NounAn instrument or means of curbing, restraining, or governing."The government is attempting to keep a rein on rising prices."
3.VerbTo direct or stop a horse by using reins.
4.VerbTo restrain; to control; to check.
5.VerbTo obey directions given with the reins.
6.NounA kidney.
7.NounThe inward impulses; the affections and passions, formerly supposed to be located in the area of the kidneys.