to wash gold

From The Collaborative International Dictionary of English v.0.48:

Wash \Wash\ (w[o^]sh), v. t. [imp. & p. p. Washed; p. pr. &
   vb. n. Washing.] [OE. waschen, AS. wascan; akin to D.
   wasschen, G. waschen, OHG. wascan, Icel. & Sw. vaska, Dan.
   vaske, and perhaps to E. water. [root]150.]
   1. To cleanse by ablution, or dipping or rubbing in water; to
      apply water or other liquid to for the purpose of
      cleansing; to scrub with water, etc., or as with water;
      as, to wash the hands or body; to wash garments; to wash
      sheep or wool; to wash the pavement or floor; to wash the
      bark of trees.
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            When Pilate saw that he could prevail nothing, . . .
            he took water and washed his hands before the
            multitude, saying, I am innocent of the blood of
            this just person.                     --Matt. xxvii.
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   2. To cover with water or any liquid; to wet; to fall on and
      moisten; hence, to overflow or dash against; as, waves
      wash the shore.
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            Fresh-blown roses washed with dew.    --Milton.
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            [The landscape] washed with a cold, gray mist.
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   3. To waste or abrade by the force of water in motion; as,
      heavy rains wash a road or an embankment.
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   4. To remove by washing to take away by, or as by, the action
      of water; to drag or draw off as by the tide; -- often
      with away, off, out, etc.; as, to wash dirt from the
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            Arise, and be baptized, and wash away thy sins.
                                                  --Acts xxii.
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            The tide will wash you off.           --Shak.
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   5. To cover with a thin or watery coat of color; to tint
      lightly and thinly.
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   6. To overlay with a thin coat of metal; as, steel washed
      with silver.
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   7. To cause dephosphorisation of (molten pig iron) by adding
      substances containing iron oxide, and sometimes manganese
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   8. To pass (a gas or gaseous mixture) through or over a
      liquid for the purpose of purifying it, esp. by removing
      soluble constituents.
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   To wash gold, etc., to treat earth or gravel, or crushed
      ore, with water, in order to separate the gold or other
      metal, or metallic ore, through their higher density.

   To wash the hands of. See under Hand.
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