This is the 2873rd most frequent Chinese word.
擦
"擦" means "to wipe" or "to rub."
The word '擦' here denotes the action of 'wiping' or 'cleaning' using a cloth or similar object.
他在桌子上擦了一下，发现还有灰尘。
He wiped the table and found there's still some dust.
Here, '擦' is used to express 'removing' a substance (frost) from a surface by wiping.
车窗上有霜，他用布擦掉了。
The car window had frost, and he wiped it off with a cloth.
'擦' in this sentence is used to highlight the act of 'erasing' or 'removing' written marks from a surface.