tagline

Short definition from Wiktionary

Noun

1. 1
   The punch line of a joke.
2. 2
   An advertising slogan.
3. 3
   A pithy quotation habitually appended to a signature in email, newsgroups, etc.
4. 4
   A line attached to a draft of cargo or a container to provide control and minimize pendulation of cargo during lifting operations.
5. 5
   A light rope attached to an object being hoisted by a crane, used to guide it while lifting or lowering.
6. 6
   Synonym of subheadline.

Verb

1. 1
   To supply with an advertising slogan; to market as.