The Collaborative International Dictionary of English v.0.48:

Black \Black\, v. t. [imp. & p. p. Blacked; p. pr. & vb. n.
   Blacking.] [See Black, a., and cf. Blacken.]
   [1913 Webster]
   1. To make black; to blacken; to soil; to sully.
      [1913 Webster]

            They have their teeth blacked, both men and women,
            for they say a dog hath his teeth white, therefore
            they will black theirs.               --Hakluyt.
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            Sins which black thy soul.            --J. Fletcher.
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   2. To make black and shining, as boots or a stove, by
      applying blacking and then polishing with a brush.
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The Collaborative International Dictionary of English v.0.48:

blacking \black"ing\, n.
   1. Any preparation for making things black; esp. one for
      giving a black luster to boots and shoes, or to stoves.
      [1913 Webster]

   2. The act or process of making black.
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WordNet (r) 3.0 (2006):

blacking
    n 1: a substance used to produce a shiny protective surface on
         footwear [syn: shoe polish, blacking]