know (something) inside out

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know (something) inside out

To know something thoroughly or down to the last detail. I've read this book so many times that I know it inside out. If you study this material for weeks, you'll know it inside out by the test date.
See also: inside, know, out

know something inside out

to know something thoroughly; to know about something thoroughly. I know my geometry inside out. I studied and studied for my driver's test until I knew the rules inside out.
See also: inside, know, out