There are a variety of synonyms for the term "fixing up." Some common alternatives include repairing, renovating, refurbishing, restoring, sprucing up, and rejuvenating. These words all relate to the idea of improving or enhancing something, whether it be a physical object or a situation. For instance, one might talk about "repairing" a damaged piece of furniture, "refurbishing" an old car, or "restoring" a historical building. Similarly, one might "spruce up" their appearance for a special occasion, or "rejuvenate" their health through a healthy diet and exercise. Overall, these synonyms offer a range of options for expressing the idea of improving or revitalizing something.