closed book Meaning in the Cambridge English Dictionary

Meaning of “closed book” in the English Dictionary

"closed book" in British English

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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…
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