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Idiom: Closed Book

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closedbook

Meanings

How to pronounce "closed book":

AU

A person or thing that cannot be easily understood; someone or something incomprehensible or puzzling.

Example Sentences

1
He's always been a closed book when it comes to sharing his feelings.
2
I don't understand calculus at all; it's like a closed book to me.
3
Her past is a closed book; she never talks about it.
4
The detective couldn't solve the case because the suspect was a closed book.
5
I can't figure out what he's thinking; he's a closed book.

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