Noah Webster's Dictionary 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.

Multi-Version Concordance Rein (3 Occurrences) James 1:26 If anyone among you thinks himself to be religious while he doesn't bridle his tongue, but deceives his heart, this man's religion is worthless. Peter's First Letter (See NIV) Job 10:1 "My soul is weary of my life. I will give free course to my complaint. I will speak in the bitterness of my soul. (See NIV) Psalms 50:19 "You give your mouth to evil. Your tongue frames deceit. (See RSV)