n. 1 check, curb, control, restraint, constraint, limitation, harness, bridle, brake You are going to have to put a rein on your expenses 2 reins. control, command, control, administration, running, leadership, power, rule, tiller, helm He should hand over the reins to a younger person
v. 3 rein in. check, curb, control, restrain, limit, harness, bridle, restrict, pull back on You will have to rein in your passions: it is not becoming to behave in this way at your age