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hold your horses
Stop what you're doing (often because you are moving too quickly or thoughtlessly). Whoa, hold your horses—I never said a bad word about you to Izzie!
hold one's horses
Slow down, be patient, as in Dad told Kevin to hold his horses on Christmas shopping, since it was only July, or Hold your horses, I'm coming. This expression alludes to a driver making horses wait by holding the reins tightly. [Slang; c. 1840]
hold (one's) horses
To restrain oneself.