know (something) backward and forward

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know (something) backward and forward

To be extremely familiar with a particular subject, field, or piece of writing, film, music, etc. Primarily heard in US. I've read this book so many times, I know it backward and forward. You should ask Samantha about the issue; she knows car engines backward and forward.
See also: and, backward, forward, know
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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