closed book
Americannoun
noun
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something deemed unknown or incapable of being understood
-
a matter that has been finally concluded and admits of no further consideration
Etymology
Origin of closed book
First recorded in 1910–15
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Given founding members of the competition could not be 'relegated' from it, critics argued the tournament was a closed book for Europe's elite teams.
From BBC • Jun. 1, 2025
“As you know, I’m not normally a closed book on this stuff,” Sean told me.
From Washington Post • Apr. 26, 2023
When she was growing up, Xie said, stories about this era were a closed book.
From New York Times • Sep. 19, 2022
And also Keeley didn’t think about that she had hurt Roy, because Roy’s a closed book.
From Los Angeles Times • Aug. 24, 2021
Dustfinger’s face was a closed book, and Meggie had the feeling that if anyone tried reading it he would rap their knuckles.
From "Inkheart" by Cornelia Funke
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
