know (something) backwards and forwards

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know (something) backwards and forwards

To be extremely familiar with a particular subject, field, or piece of writing, film, music, etc. I've read this book so many times, I know it backwards and forwards. You should ask Samantha about the issue—she knows car engines backwards and forwards.
See also: and, backward, forwards, know

know something backwards and forwards and know something forwards and backwards

Fig. to know something very well; to know a passage of language so well that one could recite it backwards as well as forwards. Of course I've memorized my speech. I know it backwards and forwards.
See also: and, backward, forwards, know