v. To fix or secure (a nail or bolt, for example) by bending down or flattening the pointed end that protrudes.v. To fasten together in this way.v. To settle definitely and conclusively; make final: "The cocktail circuit is a constant and more contracts are clinched over pâté than over paper” ( Ann L. Trebbe). v. Sports To secure (a divisional championship, for instance) before the end of regular season play by having an insurmountable lead.v. Nautical To fasten with a clinch.verb-intransitive. To be held together securely.verb-intransitive. Sports To hold a boxing opponent's body with one or both arms to prevent or hinder punches.verb-intransitive. Slang To embrace amorously.n. Something, such as a clamp, that clinches.n. The clinched part of a nail, bolt, or rivet.n. Sports An act or instance of clinching in boxing.n. Nautical A knot in a rope made by a half hitch with the end of the rope fastened back by seizing. Also called clench.n. Slang An amorous embrace.