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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.
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.