rein in (
http://definr.com/rein in)
v 1: 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" [syn:
rein]
2: control and direct with or as if by reins; as of a horse
[syn:
harness,
draw rein,
rein]
3: stop or check by or as if by a pull at the reins; "He reined
in his horses in front of the post office" [syn:
rein]