What does that prove?

What does that prove?

1. What crime or wrongdoing does that establish or demonstrate? A: "You're the only one who would have had access to the cash register between those hours." B: "So? What does that prove?" A: "That you're the only person who could have taken the money!"
2. What quality or characteristic does that meaningfully validate or demonstrate? A: "I'm going over there to knock his block off!" B: "And what does that prove? That you're tougher than he is? That you're a real man? All it proves to me is that you're just another hotheaded fool."
See also: does, that, what
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

What does that prove?

Fig. So what?; that does not mean anything. (A defensive expression. The heaviest stress is on that. Often with so, as in the examples.) Tom: It seems that you were in the apartment the same night that it was robbed. Bob: So, what does that prove? Tom: Nothing, really. It's just something we need to keep in mind. Rachel: You're late again on your car payment. Jane: What does that prove? Rachel: Simply that you can't afford the car and we are going to repossess it.
See also: does, that, what
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
Full browser ?