Is this grammatically correct? What does it mean? Any possible rephrasing You are saying a completely different thing

Yes, the sentence "You are saying a completely different thing" is grammatically correct. It means that the person is expressing something that is entirely unrelated or inconsistent with what was previously stated or understood. Here are some possible rephrasing options: 1. "You're expressing something entirely different." 2. "What you're saying is completely unrelated." 3. "You're conveying a completely different message." 4. "You're saying something that has nothing to do with the topic at hand." Each of these maintains the original meaning while offering a slightly different way to convey the idea.