an open book

noun

Definition of an open book

: a person or thing that is easy to learn about and understand My life is an open book. I have nothing to hide.

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Cite this Entry

“An open book.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/an%20open%20book. Accessed 6 Aug. 2020.

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