“Catchphrase (noun): A common or appealing phrase in popular, often unthinking,, usage; watchword or slogan. ‘…American style…overworks its catchphrases until the become not merely meaningless playtalk, like English catchphrases, but sickening, like overworked popular song.’ Raymond Chandler, Raymond Chandler Speaking”
Excerpted from: Grambs, David. The Random House Dictionary for Writers and Readers. New York: Random House, 1990.