Meaning of the word "you don't say" in English

What does "you don't say" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

you don't say

US /ju doʊnt seɪ/
UK /ju doʊnt seɪ/

Exclamation

used to express surprise or disbelief, often sarcastically, when someone states something obvious or well-known

Example:
“It’s raining outside.” “You don’t say!”
“The sun rises in the east.” “You don’t say, I had no idea!”