any word or phrase applied to a person or thing to describe an actual or attributed quality: “Richard the Lion-Hearted” is an epithet of Richard I.
a characterizing word or phrase firmly associated with a person or thing and often used in place of an actual name, title, or the like, as “man's best friend” for “dog.”
a word, phrase, or expression used invectively as a term of abuse or contempt, to express hostility, etc.