/ Dictionary / Index B breast drill: Meaning and Definition of Find definitions for: breast' drill" Pronunciation: [key] a geared drill that can be braced against the chest for additional leverage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. breastbone breasted Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language