/ Dictionary / Index B backbreaking: Meaning and Definition of Find definitions for: back•break•ing Pronunciation: (bak'brā"king), [key] — adj. demanding great effort, endurance, etc.; exhausting: a backbreaking job. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: backbreaking (Thesaurus) backbone back burner Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language