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a closed book

Idiom Literature

Meaning

something or someone that is difficult to understand

Example Sentences

"He’s a closed book when it comes to his personal life."

Related Expressions

burned out

completely exhausted or tired due to overwork

by the book

to follow the rules exactly

hit the airwaves

to start being broadcast on television or radio

penny wise, pound foolish

being careful with small amounts of money but careless with...

take aback

to surprise or shock someone suddenly

neural network

A series of algorithms that attempt to recognize underlying...