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English definition of “how come?”

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how come?

informal
C1 used to ask about the reason for something: So how come you got an invitation and not me? "I don't think I'll be able to go swimming tomorrow." "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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