Definition of “(well) what do you know!” - English Dictionary

british dictionary

“(well) what do you know!” in British English

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(well) what do you know!

informal

something you say when you are surprised by a piece of information. This phrase is often used humorously to mean the opposite:

So they're getting married, are they? Well, what do you know!
Well, what do you know! The Raiders lost again!

(Definition of “(well) what do you know!” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)