how was I to know? Meaning in Cambridge English Dictionary
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Meaning of "how was I to know?" - English Dictionary

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how was I to know?

informal
used to say that something you did wrong was not your fault because you did not have enough information to have acted differently: I just wanted to give her a surprise; how was I to know you'd already bought tickets?
(Definition of how was I to know? from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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