/ Dictionary / Index U underspin: Meaning and Definition of Find definitions for: un•der•spin Pronunciation: (un'dur-spin"), [key] — n. backspin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. undersparred understaffed Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language