pull in the reins(redirected from pull in the rein)
pull in the reins
To begin doing something more carefully or cautiously; to regain or tighten control over someone or something. This thesis you're planning is becoming wildly unfocused—I think you should pull in the reins a bit! I wish those parents would pull in the reins on their kids—the little devils are tearing the place apart!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.