change (one's) mind
1. To change one's original opinion, choice, or plan. Politicians get criticized for flip-flopping, but I think we should value the ability to change one's mind on an issue. I guess he changed his mind and decided to go to the beach instead. A: "Wait, I thought Brian was going to Penn State." B: "Hmm, guess he changed his mind because, last I heard, he was going to Villanova."
2. To persuade or cause one to change one's original opinion, choice, or plan. I never liked mushrooms before, but you really changed my mind with this dish. He's set on buying that car. Don't bother trying to change his mind. Mom has never let either of us have a curfew past 10:30, so good luck changing her mind on that.
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