v.1. To remove something by washing: I washed the dirt off. The cook washed off the grease.
2. To be removed by washing: The stain won't wash off. The dirt washed off easily.
3. To cleanse something by using water or other liquid to remove what is on it: Wash off the equipment before you put it away. I washed the dishes off and set them in the rack.
4. To cleanse oneself by using water or other liquid to remove what is on one's body: I need to wash off before dinner.