The Collaborative International Dictionary of English v.0.48:

Plashing \Plash"ing\, n.
   1. The cutting or bending and intertwining the branches of
      small trees, as in hedges.
      [1913 Webster]

   2. The dashing or sprinkling of coloring matter on the walls
      of buildings, to imitate granite, etc.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Plash \Plash\, v. i. [imp. & p. p. Plashed; p. pr. & vb. n.
   Plashing.] [Cf. D. plassen, G. platschen. Cf. Splash.]
   To dabble in water; to splash. "Plashing among bedded
   pebbles." --Keats.
   [1913 Webster]

         Far below him plashed the waters.        --Longfellow.
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The Collaborative International Dictionary of English v.0.48:

Plash \Plash\, v. t. [imp. & p. p. Plashed; p. pr. & vb. n.
   Plashing.] [OF. plaissier, plessier, to bend. Cf.
   Pleach.]
   To cut partly, or to bend and intertwine the branches of; as,
   to plash a hedge. --Evelyn.
   [1913 Webster]