There are several synonyms for the phrase "do up" that are commonly used in English. Some examples include "fix up," "tidy up," and "spruce up." These phrases are often used to describe the act of improving the appearance or functionality of something. Other synonyms for "do up" include "renovate," "refurbish," and "redesign," which are used to describe more extensive changes or updates to a space or object. Ultimately, the synonym chosen for "do up" will depend on the context in which the phrase is used and the degree of change or improvement being described.