Breadcrumb Home > Dictionary > Index B bye-bye: Meaning and Definition of Find definitions for: bye-bye Pronunciation: (interj.bī'bī'n., adv.bī'bī&sec), [key] — interj. good-bye. —n. sleep. —adv. to leave; depart; go out. to go to sleep; go to bed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bye-bye (Thesaurus) bye-blow byelaw TrendingHere are the facts and trivia that people are buzzing about. The Book of Philippians: Summary Current Events This Week: May 2023 Preamble of the United Nations Charter Queen Victoria Books of the Bible: New Testament Books in Order The 88 Recognized Constellations ✖ Related Content Daily Word Quiz: panache Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language