know (something) inside out(redirected from knows 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.
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.