closed book Meaning in the Cambridge English Dictionary

Meaning of “closed book” in the English Dictionary

"closed book" in British English

See all translations

closed booknoun [S]

uk   us   informal
a ​subject about which you ​know or ​understand nothing: I'm ​afraidphysics will always be a ​closedbook to me.
(Definition of closed book from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
Translations of “closed book”
in Chinese (Simplified) 一无所知的学科,完全不懂的学科…
in Chinese (Traditional) 一無所知的學科,完全不懂的學科…
What is the pronunciation of closed book?
Add Cambridge dictionaries to your browser to your website

“closed book” in British English

Word of the Day


a natural ability or skill

Word of the Day

Tree huggers and climate change deniers
Tree huggers and climate change deniers
by Colin McIntosh,
October 08, 2015
The climate debate is one that has predictably generated a large amount of new vocabulary, some of it originally specialized scientific terminology that has been taken up by the media and is now common currency. Some of these terms are new additions to the Cambridge English Dictionary. The two opposing sides in

Read More 

face training noun
face training noun
October 05, 2015
a system of facial exercises designed to tone the facial muscles and improve the skin

Read More