/ Dictionary / Index S southbound: Meaning and Definition of Find definitions for: south•bound Pronunciation: (south'bound"), [key] — adj. traveling southward. pertaining to southward travel. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: southbound (Thesaurus) South Bend Southbridge Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language