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Webster 1913 Edition

Noun.

The cutting or bending and intertwining the branches of small trees, as in hedges.

The dashing or sprinkling of coloring matter on the walls of buildings, to imitate granite, etc.

ppr.

Cutting and interweaving, as branches in a hedge.

Noun.

The act or operation of cutting and lopping small trees and interweaving them, as in hedges.

plashing

plashing ‎(plural plashings)

A sound that plashes, as of water.
- 1862, Samuel Ward Francis, Inside out: a curious book (page 216)
  Barest plashings of a liquid sphere; eloquent breathings of an emerald world...
The cutting or bending and intertwining the branches of small trees, as in hedges.
The dashing or sprinkling of colouring matter on the walls of buildings, to imitate granite, etc.