n. one of a pair of long straps (usually connected to the bit or the headpiece) used to control a horse
n. any means of control
v. stop or slow up one's horse or oneself by or as if by pulling the reins
v. stop or check by or as if by a pull at the reins
n. 缰绳, 统治, 支配
vt. 驾驭, 以缰绳控制, 控制
vi. 勒住马