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English definition of “how, what, why, etc. on earth...”

how, what, why, etc. on earth...

informal
C1 used when you are extremely surprised, confused, or angry about something: How on earth did this happen? Why on earth didn't you tell me before?Question words and expressions
(Definition of how, what, why, etc. on earth... from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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