rub1
[rʌb]
vt.
擦，摩擦；磨；揉；搓；按摩：
He rubbed his forehead with the back of his hand.
他用手背擦了擦前额。
使互相摩擦(常与together连用)；使触碰；蹭(常与against连用)：
It was cold,so he rubbed his hands together.
天很冷，他使劲搓着双手。
You've rubbed your trousers against some wet paint.
你把裤子蹭上了未干的油漆。