Expression why on earth

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Word lists shared by our community of dictionary fans. Sign up now or Log in. Definitions Clear explanations of natural written and spoken English. Why on earth is basically a dramatic version of " why ". Ejdaha Should I use "Why on the earth" No!

It doesn't mean anything! Ejdaha What does the following sentence mean? Are you crazy? In other words, it expresses astonishment. The speaker can't believe what he is hearing.