The Collaborative International Dictionary of English v.0.48:

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.
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            The mind doth value every moment, and then the hour
            doth rather sum up the moments, than divide the day.
                                                  --Bacon.
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   2. To bring or collect into a small compass; to comprise in a
      few words; to condense; -- usually with up.
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            "Go to the ant, thou sluggard," in few words sums up
            the moral of this fable.              --L'Estrange.
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            He sums their virtues in himself alone. --Dryden.
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   3. (Falconry) To have (the feathers) full grown; to furnish
      with complete, or full-grown, plumage.
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            But feathered soon and fledge
            They summed their pens [wings].       --Milton.
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   Summing up, a compendium or abridgment; a recapitulation; a
      r['e]sum['e]; a summary.
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   Syn: To cast up; collect; comprise; condense; comprehend;
        compute.
        [1913 Webster] Sumac