Definition of bywords:
(n) :
A proverb or proverbial expression, common saying; a frequently used word or phrase.
(n) :
A characteristic word or expression; a word or phrase associated with a person or group.
(n) :
A nickname or epithet.
(n) :
Someone or something that stands as an example (i.e. metonymically) for something else, by having some of that something's characteristic traits.
(n) :
An object of notoriety or contempt, scorn or derision.