Meaning Of The Word Closed book

Real Dictionary

What's the definition of Closed book? Find Closed book meanings, definitions and more at the Real Dictionary online.

Closed book Meaning

Closed book Definition
Closed book Definition

What's The Definition Of Closed book?

closed book in American English
noun: something that is not known or cannot be understood; a mystery or puzzle

closed book in British English
noun: something deemed unknown or incapable of being understood

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