Meaning of “you don't say!” in the English Dictionary

british dictionary

"you don't say!" in British English

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you don't say!

informal

used either to express surprise or lack of surprise in a humorous and slightly unkind way:

"He's lost his job." "You don't say!"

(Definition of “you don't say!” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)