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English definition of “Goodness/God/Heaven/Christ knows”

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Goodness/God/Heaven/Christ knows

informal
used to mean "I don't know" or to emphasize a statement. Some people may find this use offensive: God only knows what'll happen next! Take your shirt off - Heaven knows it's hot enough today!
(Definition of Goodness/God/Heaven/Christ knows from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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