To rub out something, or rub something out, is to remove writing from a surface by rubbing or wiping it with an eraser or a piece of cloth.
Examples of use:
1. I made a mistake so I rubbed it out.
2. You’ve made a spelling mistake here. Rub it out and correct it, please.
3. Can you rub out the writing on the board, please?
||rub out and rubs out|
Image by ajari