you don't say

Interjection

really?; no kidding!; is that so? (sometimes used sarcastically in response to the obvious)

Japanese Meaning

本当？ / 冗談でしょう？ / そうなんだ？

Wow, you don't say, I had no idea she moved to Tokyo.

へえ、そうなんだ、彼女が東京に引っ越したなんて知らなかった。

Sense（1）

really?; no kidding!; is that so? (sometimes used sarcastically in response to the obvious)

They're going to have a baby? You don't say!