Definitions
1.nounA proverb or proverbial expression, common saying; a frequently used word or phrase.
2.nounA characteristic word or expression; a word or phrase associated with a person or group.
3.nounSomeone or something that stands as an example (i.e. metonymically) for something else, by having some of that something's characteristic traits.
4.nounAn object of notoriety or contempt, scorn or derision.
5.nounA nickname or epithet.