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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clear the decks ❯❮ out of the closet

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Idiom of the Day

as broad as long
as broad as long Meaning: the same, whatever way you look at it. Example: He could not decide which formal suit to purchase - he thought the choice ... Read on