What makes you say so?

What makes you say so?

What has led you to that conclusion or observation? Can be used sarcastically to indicate that someone's remark was very obvious. A: "I don't believe this is going to work." B: "What makes you say so? I've run the numbers multiple times." A: "I don't think this city is very safe." B: "Huh, what makes you say so? The boarded up windows and vandalized shops?"
See also: make, say, what
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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