- you don't say!
- you don't say! (informal)An astonished rejoinder, or ironic response to the obvious or unamusing• • •Main Entry: ↑say
* * *informal used to express amazement or disbelief
* * *you don't ˈsay! idiom(informal, often ironic) used to express surprise
‘They left without us.’ ‘You don't say!’(= I'm not surprised)Main entry: ↑sayidiom
Useful english dictionary. 2012.