/ Dictionary / Index T tag day: Meaning and Definition of Find definitions for: tag' day" Pronunciation: [key] a day on which contributions to a fund are solicited, each contributor receiving a tag. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tag boat tag end Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language