Source : Webster's Revised Unabridged Dictionary (1913)

Sum \Sum\, v. t. [imp. & p. p. {Summed}; p. pr. & vb. n.
   {Summing}.] [Cf. F. sommer, LL. summare.]
   1. To bring together into one whole; to collect into one
      amount; to cast up, as a column of figures; to ascertain
      the totality of; -- usually with up.

            The mind doth value every moment, and then the hour
            doth rather sum up the moments, than divide the day.
                                                  --Bacon.

   2. To bring or collect into a small compass; to comprise in a
      few words; to condense; -- usually with up.

            ``Go to the ant, thou sluggard,'' in few words sums
            up the moral of this fable.           --L'Estrange.

            He sums their virtues in himself alone. --Dryden.

   3. (Falconry) To have (the feathers) full grown; to furnish
      with complete, or full-grown, plumage.

            But feathered soon and fledge They summed their pens
            [wings].                              --Milton.

   {Summing up}, a compendium or abridgment; a recapitulation; a
      r['e]sum['e]; a summary.

   Syn: To cast up; collect; comprise; condense; comprehend;
        compute.

Source : WordNet®

summing up
     n : a concluding summary (as in presenting a case before a law
         court) [syn: {summation}, {rundown}]