/ Dictionary / Index O open couplet: Meaning and Definition of Find definitions for: o'pen cou'plet Pronunciation: [key] a couplet that concludes with a run-on line. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. open convention open cover Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language