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. © 2024 Farlex, Inc, all rights reserved.