rein (someone or something) in

rein (someone or something) in

To tighten control over someone or something; to restrain, slow down, or diminish someone or something. You need to rein in your journalists; they can't be writing such inflammatory pieces about the president. I'm trying to rein in my enthusiasm a bit, because I don't want to be disappointed.
See also: rein

rein someone or something in

to bring someone or something under control; to slow down someone or something. Fred is getting out of hand. The boss undertook to rein him in a bit. The boss is trying to rein in Jane's enthusiasm.
See also: rein

rein in

v.
1. To restrain or control something or someone: The coalition tried to rein in its more militant members. I reined my anger in and refused to fight.
2. To make a horse move more slowly or stop by pulling back on reins: Rein in your horse while this truck goes by. The horses wanted to break free, but the rancher reined them in.
See also: rein