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Meaning of jim dash

jim' dash"

Pronunciation: ( jim), [key]
— Print., Journalism. Print.,Journalism.
  1. a dash, often three ems long, used within a headline, between the headline and the main body of printed matter, between items in a single column, or between related but different material within a story.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.