That door needs rubbing down before you paint it.

【rub】那扇门需要打磨一下再上油漆。

I lent the stablemen a hand in rubbing down their horses.

我借给马厩夫帮他们揉马。

I'm smoothing it, I'm patting it, I'm rubbing it down, I'm saying safe place.

我正在抚平它，我正在拍打它，我正在擦拭它，我说的是安全的地方。