Webster's English Dictionary

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clench

1. clench \'klench\ vt [ME clenchen, fr. OE -clencan; akin to OE clingan to 
   cling] 1: CLINCH  2: to hold fast : CLUTCH  3: to set or close tightly 
2. clench n 1: the end of a nail that is turned back in clinching it  2: an 
   act or instance of clenching