Definition of catch line
1a : a line containing a catchword b : a short line (as of less important words in a title or display advertisement) between lines that are longer and sometimes larger c : an identification line (as on a printer's proof or a manuscript)
2 : a phrase or sentence designed to catch attention especially in an advertisement or as a heading or title of a story, article, or newspaper item
3 : a line in a theatrical production expected to cause a laugh and often repeated as a gag
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