be sold on (something)
To be confident in or convinced about something's viability, veracity, etc., often to the point of being enthusiastically supportive of it. I don't know, this plan still sounds pretty risky to me—I'm not sold on it yet. After seeing the presentation, I'm sold on this investment—let's do it! A: "What do you think about the new quarterback?" B: "I know he's supposed to be the best in the league, but I'm not sold on him yet."
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