Meaning oftag linein English

Noun

1. a key phrase summarizing a main idea; captures the essence
2. a memorable advertising phrase; promotes a product
3. a brief quotation added to a signature (in emails, etc.)
   The company added a tag line to their email signature for marketing purposes.
4. the final line of a joke; provides humor
   The comedian delivered a joke with a tag line that left the audience laughing.
5. a sentence part attributing dialogue to its speaker; indicates authorship
   In the novel, the tag line "said John" indicated that the dialogue was spoken by John.