hold one’s horses

hold your horses

Wait a moment or be patient (often because you are moving too quickly or thoughtlessly). Whoa, hold your horses, kids. We're going to sing before we start eating cake. I know you're excited to see the prototype, but you all just need to hold your horses while we get set up.
See also: hold, horse
Farlex Dictionary of Idioms.

hold one’s horses

tv. to wait up; to relax and slow down; to be patient. (Usually a command.) Now, just hold your horses and let me explain.
See also: hold, horse
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • hold horses
  • hold one's horses
  • hold your horses
  • Hold your horses!
  • get ahead of (oneself)
  • get ahead of oneself
  • take it easy
  • take it/things easy
  • double buffalo
  • take things easy