/ Dictionary / Index C clincher: Meaning and Definition of Find definitions for: clinch•er Pronunciation: (klin'chur), [key] — n. a person or thing that clinches. a statement, argument, fact, situation, or the like, that is decisive or conclusive: The heat was the clincher that made us decide to leave the city. a nail, screw, etc., for clinching. a clincher tire. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: clincher (Thesaurus) clinch clincher-built 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