/ Dictionary / Index Y yup: Meaning and Definition of Find definitions for: yup Pronunciation: (yup), [key] — adv., n. Informal. yes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Yunnan Yupik Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language