you don't say

you don't say idiom
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]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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