/ Dictionary / Index B back gear: Meaning and Definition of Find definitions for: back' gear" Pronunciation: [key] (in a lathe) one of several gears for driving the headstock at various speeds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. backgammon background Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language