/ Dictionary / Index T thumbs-down: Meaning and Definition of Find definitions for: thumbs-down Pronunciation: (thumz'doun'), [key] — n. Informal. an act or instance of dissent, disapproval, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thumbscrew thumbstall Related Content Daily Word Quiz: wizened Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language