/ Dictionary / Index S Sunday clothes: Meaning and Definition of Find definitions for: Sun'day clothes' Pronunciation: [key] a person's best or newest clothing, as saved for Sundays and special occasions. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sunday baby Sunday driver Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language