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open book

someone or something easily understood or interpreted; something very clear:
The child's face is an open book.
Origin of open book
1850-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for open book
Contemporary Examples
Historical Examples
  • The heath lay as an open book before him, and he studied it with delight.

  • All three bent on the ground eyes accustomed to read there as in an open book.

    Wood Rangers Mayne Reid
  • I sit for hours with the open book before me and never see a line that is printed there.

    Flower of the Dusk Myrtle Reed
  • She would have liked to feel that her heart was an open book for her friends to read.

    Robert Orange John Oliver Hobbes
  • In the ring of light under the lamp was an open book, an inkstand and a pen.

    Tales of the Five Towns Arnold Bennett
  • There was a centre table in the room and an open book on it.

    The Johnstown Horror James Herbert Walker
British Dictionary definitions for open book

open book

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

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


Her life is an open book.'s 21st Century Lexicon
Copyright © 2003-2014, LLC
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Idioms and Phrases with open book

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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