closed book, a
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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]
QUIZ
QUIZ YOURSELF ON OPPOSITES OF RED BEFORE YOU TURN SCARLET
We have a challenge that will make you blush: do you know the many words and ways to describe the opposite of red?
Question 1 of 7
Which of the following colors is used to symbolize AIR?
Words nearby closed book, a
aclasis, aclastic, acle, acleistocardia, aclinic line, closed book, a, A.C.L.S., ACLU, ACM, acme, acmeism
The American Heritage® Idioms Dictionary
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