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Meaning of catchline

catch•line

Pronunciation: (kach'līn"), [key]
— n.
  1. a word, phrase, or sentence used, esp. in advertising or journalism, to arouse or call attention.
  2. a line in which a catchword appears.
  3. a line of lesser importance, set shorter or sometimes in smaller type than the lines above and beneath it.
  4. a line of comic dialogue expected to elicit laughter.
  5. slug (def. 10a).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.