v.1. To cause something to be washed off the skin by sweating: The actor sweated off his makeup while acting under the hot lights. The children had sweated the sunscreen lotion off, so I made them reapply it.
2. To shed some weight by sweating: I fell asleep in the sauna, and I feel like I sweated off five pounds. Eat dessert tonight, and then sweat it off at the gym tomorrow.