definition of
rein

[1] #1 rein n. one of a pair of long straps (usually connected to the bit or the headpiece) used to control a horse. wn

[2] #2 rein v. [harness, rein in, draw rein] control and direct with or as if by reins; "rein a horse". wn

[3] #3 rein n. any means of control; "he took up the reins of government". wn

[4] #4 rein v. [rein in] stop or slow up one's horse or oneself by or as if by pulling the reins; "They reined in in front of the post office". wn

[5] #5 rein v. [rein in] stop or check by or as if by a pull at the reins; "He reined in his horses in front of the post office". wn