/ Dictionary / Index S sponge bag: Meaning and Definition of Find definitions for: sponge' bag" Pronunciation: [key] — Brit. Brit. a small, usually waterproof, case for carrying toilet articles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sponge sponge bath 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