catch phrase vs dictum

catch phrase

dictum

noun
  • An authoritative statement; a dogmatic saying; a maxim, an apothegm. 

  • The report of a judgment made by one of the judges who has given it. 

  • An arbitrament or award. 

  • A judicial opinion expressed by judges on points that do not necessarily arise in the case, and are not involved in it. 

How often have the words catch phrase and dictum occurred in a corpus of books? (source: Google Ngram Viewer )