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The Collaborative International Dictionary
To pile arms

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.

    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.