REIN

Definition

1. noun one of a pair of long straps (usually connected to the bit or the headpiece) used to control a horse.
2. noun any means of control.
3. verb control and direct with or as if by reins. — synonyms: harness, rein_in, draw_rein
4. verb stop or slow up one's horse or oneself by or as if by pulling the reins. — synonyms: rein_in
5. verb stop or check by or as if by a pull at the reins. — synonyms: rein_in
6. verb keep in check. — synonyms: rule, harness