/ Dictionary / Index B baby bust: Meaning and Definition of Find definitions for: ba'by bust" Pronunciation: [key] a period of sharp decrease in the birthrate, as that in the United States after 1965. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. baby boomer baby carriage 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