Webster's English Dictionary

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clinch

1. clinch \'klinch\ vb [prob. alter. of 1clench] 1a: to turn over or 
   flatten the protruding pointed end of (a driven nail);  also : to treat (a 
   screw, bolt, or rivet) in a similar way 1b: to fasten in this way  2: 
   CLENCH  3: to make final or irrefutable : SETTLE  1: to hold an opponent 
   (as in boxing) at close quarters with one or both a rms 2: to hold fast or 
   firmly 
2. clinch n 1: a fastening by means of a clinched nail, rivet, or bolt; 
   also :  the clinched part of a nail, bolt, or rivet archaic  2: PUN  3: an 
   act or instance of clinching in boxing