Dad: Come on kids! Let's go! We're going to be late.
Kid: Dad, hold your horses.
Joe: Let's go! I don't want to miss the beginning of the movie.
Tom: Hold your horses! I'm coming.
Meaning: "To hold your horses" is used when you tell someone to "wait" or "hold on." People usually say "hold your horses" when they feel like the other person is being a little impatient or too much in a hurry.