Webster's English Dictionary

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wrench

1. wrench \'rench\ vb [ME wrenchen, fr. OE wrencan; akin to OHG renken, L 
   verger]e to bend, incline 1: to move with a violent twist; also : to 
   undergo twisting  2: to pull or strain at something with violent twisting  
   1: to twist violently  2: to injure or disable by a violent twisting or 
   straining  3: CHANGE; esp : DISTORT, PERVERT  4a: to pull or tighten by 
   violent twisting or with violence  4b: to snatch forcibly : WREST  5: to 
   cause to suffer anguish : RACK 
2. wrench n 1a: a violent twisting or a pull with or as if with twisting  
   1b: a sharp twist or sudden jerk straining muscles or ligaments; also  : 
   the resultant injury (as of a joint) 1c: ALTERATION; esp : DISTORTION  1d: 
   acute emotional distress : sudden violent mental change  2: a hand or power 
   tool for holding, twisting, or turning an object (as a b olt or nut)