/ Dictionary / Index U upbound: Meaning and Definition of Find definitions for: up•bound Pronunciation: (up'bound'), [key] — adj. traveling or affording passage toward the north or in a direction regarded as up: an upbound freighter; the upbound lane of a highway. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: upbound (Thesaurus) upbeat up-bow Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language