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closed book, a



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Idioms and Phrases

A secret, mystery, or puzzle, as in I can't figure her out; she's a closed book to me . This term alludes to information one can't obtain or comprehend (because the book is closed). [Early 1900s]

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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.

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