dredging


From The Collaborative International Dictionary of English v.0.48:

Dredge \Dredge\ (dr[e^]j), v. t. [imp. & p. p. Dredged
   (dr[e^]jd); p. pr. & vb. n. Dredging.]
   To catch or gather with a dredge; to deepen with a dredging
   machine. --R. Carew.
   [1913 Webster]

   Dredging machine, a machine (commonly on a boat) used to
      scoop up mud, gravel, or obstructions from the bottom of
      rivers, docks, etc., so as to deepen them.
      [1913 Webster]
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