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

dot the i’s and cross the t’s

Meaning: to take care of every detail, even minor ones

Example: I had dotted all the i's and crossed the t's, so I wondered why my application was rejected. Read on

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