"Memento Mori" is a Latin phrase that translates to "remember death." This phrase has been used as a reminder that we are mortal beings, and we should be mindful of our actions and how we spend our precious time. Synonyms for this phrase include "carpe diem," which translates to "seize the day," and "tempus fugit," which means "time flies." Other related terms include "vanitas," meaning "vanity," and "ars moriendi," which refers to the art of dying well. These phrases have been used to remind us to cherish every moment and make the most of our time, as life is fleeting.