"[wipe] the slate clean"의 정의 및 의미

What is the origin of the idiom "wipe the slate clean" and when to use it?

The origin of the phrase comes from the practice of writing on a slate board with chalk, which could easily be wiped clean with a damp cloth. This made it a useful tool for teachers to use with students, as they could easily correct mistakes and start over. The metaphorical use of the phrase in regard to personal relationships or business dealings likely stems from the idea that, like a slate board, mistakes and offenses can be wiped away, allowing for a fresh start. The phrase has been in use since at least the mid-1800s and continues to be a common expression today.