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English definition of “how come?”

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how come?

informal
C1 used to ask how or why something has happened: So how come you missed the train? "We had to stop in Birmingham." "How come?"
Translations of “how come?”
in Chinese (Traditional) 為甚麼?怎麼會?…
in Chinese (Simplified) 为什么?怎么会?…
(Definition of how come? from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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