verb
to express strong disapproval or disagreement; to argue or reason with someone in order to dissuade or correct them
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The lawyer began to expostulate with the judge about the unfair ruling.
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She always expostulates with her parents when she doesn't get her way.
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I heard him expostulate with his boss after being passed over for a promotion.
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The artist used his painting to expostulate against social injustice.