The phrase "tread under foot" implies that someone or something is being treated harshly and without regard. There are several other phrases and synonyms for this expression, including "trampled on," "crushed," "abused," and "treated poorly." Other related phrases include "walked over," "ignored," "disrespected," and "trampled upon." These words and phrases convey a sense of disrespect and mistreatment, and can be used to describe situations in which someone is being taken advantage of or mistreated. By using these synonyms, writers and speakers can add depth and nuance to their descriptions of situations in which people or things are being mistreated.