Burning off refers to the process of removing something, particularly fuel, by lighting a fire. The opposite of burning off can have different meanings depending on the context. In terms of health and fitness, antonyms for burning off include gaining weight or accumulating fat. In agriculture, saving crops or preserving foliage can be antonyms for burning off. In the field of environment, protecting habitats or reducing greenhouse gas emissions can be antonyms for burning off. Overall, opposite terms for burning off represent actions that prevent, preserve or conserve instead of removing or eliminating something.