how was I to know? - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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English definition of “how was I to know?”

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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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