/ Dictionary / Index T threes and eights: Meaning and Definition of Find definitions for: threes' and eights' Pronunciation: [key] — CB Slang. CB Slang. best wishes; good luck: used as a sign-off. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. three R's threescore Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language