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back to front
01
used to indicate one's complete knowledge or understanding of something
Idiom
What is the origin of the idiom "back to front" and when to use it?
The origin of the phrase "back to front" is not precisely documented, but it is an idiom used to describe a deep and thorough understanding or knowledge of a subject. It suggests that someone is highly familiar with every aspect, detail, or component of that subject, as if they have explored it completely from one end to the other, much like knowing both the front and back of a book.
Examples
She knows the system back to front, so ask her if you get stuck.
