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English definition of “I don't know how, what, why, etc.”

I don't know how, what, why, etc.

used to add force to criticisms, expressions of surprise, etc.: I don't know how you can eat that revolting stuff! I don't know why you bother.InterjectionsSounds used as interjections
(Definition of I don't know how, what, why, etc. from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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