closed bookMeaning: 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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behind closed doors ❯❮ out of the closet
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in the darkin the dark Meaning: uninformed, a state of ignorance. Example: We’re still in the dark about the company’s layoff policy. Another forms of in the dark Idiom: keep ... Read on
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