The Collaborative International Dictionary of English v.0.48:

Wrench \Wrench\, v. t. [imp. & p. p. Wrenched; p. pr. & vb. n.
   Wrenching.] [OE. wrenchen, AS. wrencan to deceive,
   properly, to twist, from wrenc guile, deceit, a twisting.
   ????. See Wrench, n.]
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   1. To pull with a twist; to wrest, twist, or force by
      violence.
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            Wrench his sword from him.            --Shak.
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            Forthwith this frame of mine was wrenched
            With a woeful agony.                  --Coleridge.
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   2. To strain; to sprain; hence, to distort; to pervert.
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            You wrenched your foot against a stone. --Swift.
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