Breadcrumb Home > Dictionary Cite Meaning of run-in Find definitions for: run-in Pronunciation: (run'in"), [key] — n. a quarrel; argument. matter that is added to a text, esp. without indenting for a new paragraph. —adj. added to a text without indenting. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. runic Runjeet Singh Related Content Daily Word Quiz: persiflage Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language