/ Dictionary / Index R rubout: Meaning and Definition of Find definitions for: rub•out Pronunciation: (rub'out"), [key] — n. Slang. a murder or assassination. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ruboff rubric Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language