/ Dictionary / Index T T.B.O.: Meaning and Definition of Find definitions for: T.B.O. Pronunciation: [key] — Theat. Theat. total blackout. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. T-bill T-bond Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language