There are a variety of synonyms for the phrase "under foot," including "underneath," "below," "beneath," and "lower." Other options include "at one's feet," "within arm's reach," and "close at hand." These expressions are often used to describe something that is physically close by or accessible, but may also be used metaphorically to refer to something that is affecting or impeding one's progress. When choosing a synonym for "under foot," it's important to consider the connotations and context of the phrase to ensure that the replacement word accurately captures the intended meaning.