The Collaborative International Dictionary of English v.0.48:

Flitch \Flitch\, v. t. [imp. & p. p. Flitched; p. pr. & vb. n.
   Flitching.] [See Flitch, n.]
   To cut into, or off in, flitches or strips; as, to flitch
   logs; to flitch bacon.
   [Webster 1913 Suppl.]