heaven knows

idiom

Definition of heaven knows

informal
used to stress that something is not known "How long will the meeting last?" "Heaven (only) knows."

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heaven knows

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Cite this Entry

“Heaven knows.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heaven%20knows. Accessed 1 Dec. 2021.

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