What is Rub ?
Rub is (verb) to move something across the surface of something else He rubbed his hands together to get them warm. These new shoes have rubbed against my heel and given me a blister. The cat rubbed herself against my legs. (NOTE: rubbing rubbed) (noun) the action of rubbing She gave her shoes a quick rub to remove the dust. He hit his head on the low ceiling, and gave it a rub.
source: Easier English, Student Dictionary Upper Intermediate Level