The phrase "fixed up on" can have various meanings, from being dressed nicely to being set up with a date. Depending on the context, some other synonyms for this phrase could include "gussied up," "spruced up," "dolled up," "tidied up," "made over," "arranged for," "paired with," or "matched up." These synonyms can help convey subtle nuances in meaning and add variety to one's language usage. For instance, "paired with" or "matched up" could suggest a more intentional and deliberate arrangement than simply being "set up with," while "dolled up" or "gussied up" could imply a focus on appearance over other aspects.