Meaning of “how come?” in the English Dictionary

british dictionary

"how come?" in British English

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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?"

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?"

(Definition of “how come?” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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