to milk the street

Milk \Milk\ (m[i^]lk), v. t. [imp. & p. p. {Milked} (m[i^]lkt);
   p. pr. & vb. n. {Milking}.]
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   1. To draw or press milk from the breasts or udder of, by the
      hand or mouth; to withdraw the milk of. "Milking the
      kine." --Gay.
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            I have given suck, and know
            How tender 't is to love the babe that milks me.
                                                  --Shak.
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   2. To draw from the breasts or udder; to extract, as milk;
      as, to milk wholesome milk from healthy cows.
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   3. To draw anything from, as if by milking; to compel to
      yield profit or advantage; to plunder. --Tyndale.
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            They [the lawyers] milk an unfortunate estate as
            regularly as a dairyman does his stock. --London
                                                  Spectator.
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   {To milk the street}, to squeeze the smaller operators in
      stocks and extract a profit from them, by alternately
      raising and depressing prices within a short range; --
      said of the large dealers. [Cant]

   {To milk a telegram}, to use for one's own advantage the
      contents of a telegram belonging to another person. [Cant]
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