There are a variety of synonyms for the phrase "goes on foot." For example, one could say someone is walking, hiking, trekking, or strolling. Additionally, the word "ambulating" could be used to describe someone moving on foot, as could the phrase "tramping around." Other options might include "rambling," "sauntering," "roaming," or "wandering" on foot. Ultimately, there are many ways to describe the act of moving on foot, and the choice of synonym may depend on the context, tone, and specific nuance that the speaker or writer wishes to convey.