Correct Answer: To tell someone to stop and consider carefully

Solution : The fourth option is correct.

Explanation: The idiom hold your horses is a figurative expression that means to ask someone to be patient or to wait. The phrase is often used to caution against impatience or to encourage someone to slow down and think before taking action. Grammatically, it functions as an imperative sentence, instructing the listener to pause or reconsider.

Therefore, the correct meaning of the idiom is, "to tell someone to stop and consider carefully ".