The phrase "kisses someone's feet" implies a subservient act of reverence, devotion, or supplication towards another person. Synonyms for this phrase include "grovels," "prostrates," "submits," "obeys," "worships," or "pays homage." Each of these words conveys a similar sentiment of deference or adoration to someone in a position of authority or superiority. However, these words can also be used figuratively to describe a situation in which someone is willing to go to great lengths or make significant sacrifices to please or impress another person.