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English definition of “that's a new one on me.”

that's a new one on me.

informal
said when someone has just told you a surprising fact that you did not know before: "Sian and Richard are getting married." "Really! That's a new one on me!"Expressions of surprise
(Definition of that's a new one on me. from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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