Meaning of the word "closed book" in English
What does "closed book" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.
closed book
US /kloʊzd bʊk/
UK /kləʊzd bʊk/
Idiom
a subject or person about which one knows nothing or very little
Example:
•
Quantum physics is a closed book to me.
•
His past is a closed book; he never talks about it.