Source : Webster's Revised Unabridged Dictionary (1913)

Hill \Hill\, v. t. [imp. & p. p. {Hilled}; p. pr. & vb. n.
   {Hilling}.]
   To surround with earth; to heap or draw earth around or upon;
   as, to hill corn.

         Showing them how to plant and hill it.   --Palfrey.

Hilling \Hill"ing\, n.
   The act or process of heaping or drawing earth around plants.