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closed book
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closed book
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closed book
–noun
something that is not known or cannot be understood; a mystery or puzzle:
Abstract art is a closed book as far as I'm concerned.
Origin:
1910–15
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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closed book
closed book
n. A person or thing that cannot be known or understood; something unfathomable or puzzling.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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