rein in

verbs

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"
rein, rein in
control and direct with or as if by reins
"rein a horse"
draw rein, harness, rein, 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"
rein, rein in