• A closed book is an expression used when you accept something that has completely ended.

  • Something you don’t understand or know anything about.

  • A secret, mystery, or puzzle.

1. Today’s meeting is about terminating our project, it’s now a closed book.

 

2. I can’t figure her out, she’s a closed book to me.

 

3. Matthew is a closed book which makes it hard for me, as a teacher, to reach out to him.

 

4. I’m afraid mathematics will always be a closed book to me.

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