ETYM French ręne, from (assumed) Late Lat. retina, from Latin retinere to hold back. Related to Retain.
(Homonym: rain, reign).
1. Any means of control.
2. One of a pair of long straps (usually connected to the bit or the headpiece) used to control a horse.

ETYM See Rein (n.).
(Homonym: rain, reign).
1. To stop or check by or as if by a pull at the reins; SYN. rein in.
2. To stop or slow up one's horse or oneself by or as if by pulling the reins; SYN. rein in.