/ Dictionary / Index G green flag: Meaning and Definition of Find definitions for: green' flag' Pronunciation: [key] (in automobile racing) a green-colored flag that is used to signal the start of a race. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. green fish green flash Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language