Source : Webster's Revised Unabridged Dictionary (1913)

Flay \Flay\, v. t. [imp. & p. p. {Flayed}; p. pr. & vb. n.
   {Flaying}.] [OE. flean, flan, AS. fle['a]n; akin to D. vlaen,
   Icel. fl[=a], Sw. fl[*a], Dan. flaae, cf. Lith. ples? to
   tear, plyszti, v.i., to burst tear; perh. akin to E. flag to
   flat stone, flaw.]
   To skin; to strip off the skin or surface of; as, to flay an
   ox; to flay the green earth.

         With her nails She 'll flay thy wolfish visage. --Shak.

Source : WordNet®

flay
     v : strip the skin off