By halves

from 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]