The Collaborative International Dictionary of English v.0.48:

Pile \Pile\, v. t. [imp. & p. p. Piled; p. pr. & vb. n.
   Piling.]
   1. To lay or throw into a pile or heap; to heap up; to
      collect into a mass; to accumulate; to amass; -- often
      with up; as, to pile up wood. "Hills piled on hills."
      --Dryden. "Life piled on life." --Tennyson.
      [1913 Webster]

            The labor of an age in piled stones.  --Milton.
      [1913 Webster]

   2. To cover with heaps; or in great abundance; to fill or
      overfill; to load.
      [1913 Webster]

   To pile arms To pile muskets (Mil.), to place three guns
      together so that they may stand upright, supporting each
      other; to stack arms.
      [1913 Webster] Pileate