pull in the reins

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!
See also: pull, reins
Farlex Dictionary of Idioms.
See also:
  • (someone or something) promises well
  • (do) (you) want to make something of it?
  • accompanied by
  • accompanied by (someone or something)
  • accompany
  • a fast talker
  • (have) got something going (with someone)
  • a ghost at the feast
  • a/the feel of (something)
  • (I) wouldn't (do something) if I were you