open book

noun
someone or something easily understood or interpreted; something very clear: The child's face is an open book.

Origin:
1850–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
open book
 
n
a person or thing without secrecy or concealment that can be easily known or interpreted

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Dictionary.com's 21st Century Lexicon
Main Entry:  open book
Part of Speech:  n
Definition:  something or someone that is easily understandable; something that is very clear; someone who conceals nothing
Example:  Her life is an open book.
Dictionary.com's 21st Century Lexicon
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American Heritage
Idioms & Phrases

open book

Something or someone that can be readily examined or understood, as in His entire life is an open book. This metaphoric expression is often expanded to read someone like an open book, meaning "to discern someone's thoughts or feelings"; variations of this metaphor were used by Shakespeare: "Read o'er the volume of young Paris' face," (Romeo and Juliet, 1:3) and "O, like a book of sport thou'lt read me o'er" (Troilus and Cressida, 4:5). [Mid-1800s] For an antonym, see closed book.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
When you are involved in politics, your life is an open book, and people can come in who don't necessarily have good intent.
If to the swallow life is an open book, to the snail it is unfathomable.
The exams are open book and the required books for each exam category can be found on the licensing requirements for each license.
Successful completion of an open book written jurisprudence exam.
Idioms & Phrases
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