/ Dictionary / Index S sump pump: Meaning and Definition of Find definitions for: sump' pump" Pronunciation: [key] a pump for removing liquid or wastes from a sump. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sump sumpsimus Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language