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open book

noun
1.
someone or something easily understood or interpreted; something very clear:
The child's face is an open book.
Origin
1850-1855
1850-55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for open book
  • 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.
British Dictionary definitions for open book

open book

noun
1.
a person or thing without secrecy or concealment that can be easily known or interpreted
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for open book
noun

something or someone that is easily understandable; something that is very clear; someone who conceals nothing

Examples

Her life is an open book.

Dictionary.com's 21st Century Lexicon
Copyright © 2003-2014 Dictionary.com, LLC
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Idioms and Phrases with 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® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Difficulty index for open book

Few English speakers likely know this word

Word Value for open

6
8
Scrabble Words With Friends

Quotes with open book