you don't say

1. How surprising, is that true? Also, I find that hard to believe. For example, I've been working on this project for two years.—You don't say, or The man who runs this soup kitchen is a real saint.—You don't say! This expression, a shortening of you don't say so, may be used straightforwardly or ironically. [Late 1800s]

Example Sentences

“If you know something and don’t say anything about it, that means you’re in agreement. If you don’t say something, that means you’re OK with a 21-year-old child being gunned down in the street like a dog.”

From Los Angeles Times

You should say you’re very busy, you know, whatever—you don’t say things like that—but it’s the truth.

From Salon

You don’t say anything unless you have the evidence to back it up.

From Salon

If you don’t say that, then voters are in fact going to assume that they’re electing you to serve another four years.

From Slate

“Some of the things he says, it’s all right to say it at a bar with your buddies, but you don’t say that stuff out loud,” said Schofield, a 63-year-old chemical salesman.

From Los Angeles Times