dialogue tag vs tag line

dialogue tag

noun
  • Used other than figuratively or idiomatically: see dialogue, tag. 

  • A sentence part that attributes a piece of written dialogue to its speaker. (e.g. In "Get out of here," he said, "he said" is a dialogue tag.) 

tag line

noun
  • Synonym of dialogue tag 

How often have the words dialogue tag and tag line occurred in a corpus of books? (source: Google Ngram Viewer )