rein in
ITEM OF HORSE TACK, USED TO DIRECT A HORSE OR OTHER ANIMAL USED FOR RIDING OR DRIVING
Reins; Rein in; Double rein; Curb rein; Snaffle rein
To rein in something means to control it.
His administration's economic policy would focus on reining in inflation...
Mary spoiled both her children, then tried too late to rein them in.
PHRASAL VERB: V P n (not pron), V n P