/ Dictionary / Index B breakneck: Meaning and Definition of Find definitions for: break•neck Pronunciation: (brāk'nek"), [key] — adj. reckless or dangerous, esp. because of excessive speed; hazardous: He raced through the streets at breakneck speed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: breakneck (Thesaurus) break-in period break of day Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language