The Collaborative International Dictionary of English v.0.48:
Pile \Pile\, v. t. [imp. & p. p. Piled; p. pr. & vb. n.
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.
The labor of an age in piled stones. --Milton.
2. To cover with heaps; or in great abundance; to fill or
overfill; to load.
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