closed book, a
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]
Why Is Thursday Named For a Comic Book Character?Maybe you've read the comic books or seen some of the Marvel movies that feature a big blond guy named Thor, founding member of the Avengers and brother of Loki. But, Thursday is a bigger tribute to the Norse god of thunder than any movie or comic book upon which it's based. After all, it is “Thor’s day.”
Words All Book Lovers Should Be UsingRead more in this article about some frequently asked questions and fun facts related to our definitions.
- closed anesthesia,
- closed book,
- closed chain,
- closed chain compound,
- closed chest massage,
- closed circuit,
- closed circuit method
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.