/ Dictionary / Index S Soap Box Derby: Meaning and Definition of Find definitions for: Soap' Box Der'by Pronunciation: [key] — Trademark. Trademark. a race for children driving motorless, wooden vehicles built by the drivers to resemble racing cars. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. soapbox soap bubble 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