/ Dictionary / Index F fat lip: Meaning and Definition of Find definitions for: fat' lip' Pronunciation: [key] a swollen mouth or lip, as from a blow: He said if I didn't shut up he'd give me a fat lip. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fatling fatly Related Content Daily Word Quiz: longevity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language