Verb
1. control and direct with or as if by reins;
"rein a horse"2. 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"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"4. keep in check;
"rule one's temper"