REIN, n. L. retina, retinaculum. If contracted from the Latin, it is from retineo, otherwise from the root of arrest.
1. The strap of a bridle, fastened to the curb or snaffle on each side, by which the rider of a horse restrains and governs him.
2. The instrument of curbing, restraining or governing government.
To give the reins, to give license to leave without restraint.
To take the reins, to take the guidance or government.
REIN,
1. To govern by a bridle.
2. To restrain to control.