know backwards and forwards and know forwards and backwards
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.
know (something) forward(s) and backward(s)
To be extremely familiar with a particular subject, field, or piece of media. Primarily heard in US. I've read this book so many times, I know it forwards and backwards. Samantha knows engines forward and backward, so you should ask her about the trouble you're having with your car.
know (something) forwards and backwards
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 forwards and backwards. You should ask Samantha about the issue—she knows car engines forwards and backwards.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.