The Collaborative International Dictionary of English v.0.48:

Turf \Turf\, v. t. [imp. & p. p. Turfed; p. pr. & vb. n.
   Turfing.]
   To cover with turf or sod; as, to turf a bank, or the border
   of a terrace. --A. Tucker.
   [1913 Webster]