rub something out
phrasal verb with rub verb [ I or T ] uk/rʌb/ us/rʌb/ -bb-
UK
B2 （用橡皮、布等）擦掉，抹掉（字迹、痕迹等）
to remove writing or a mark from something by rubbing it with a piece of rubber or a cloth
It's in pencil, so you can rub it out if you need to. 这是用铅笔写的，需要的话可以很容易擦掉。