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English definition of “I'll be hanged if I know”

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I'll be hanged if I know

( also I'm hanged if I know) UK old-fashioned informal
used to say that you certainly do not know
Translations of “I'll be hanged if I know”
in Chinese (Traditional) 如果我知道我就不得好死…
in Chinese (Simplified) 如果我知道我就不得好死…
(Definition of I'll be hanged if I know from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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