closed book

closed book
Meaning: something that one knows or understands nothing about.
Example: I’m afraid that this new physics formula will always be a closed book to me.

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Idiom of the Day

call bluff

Meaning: to challenge to prove one's claim, when they are likely attempting to deceive

Example: When the employee threatened to quit if he was not given a pay rise, the boss called his bluff. Read on

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