The Collaborative International Dictionary of English v.0.48:

Halves \Halves\ (h[aum]vz), n.,
   pl. of Half.
   [1913 Webster]

   By halves, by one half at once; halfway; fragmentarily;
      partially; incompletely.
      [1913 Webster]

            I can not believe by halves; either I have faith, or
            I have it not.                        --J. H.
                                                  Newman.
      [1913 Webster]

   To go halves. See under Go.
      [1913 Webster]