[1] : The Collaborative International Dictionary of English v.0.48

upside \up"side`\, n.
   1. the upper side; the part that is uppermost.
      1913 webster

   2. the benefits; the positive features; -- said of a
      situation or event that has both positive good and
      negative bad aspects.
      pjc

   to be upsides with, to be even with. prov. eng.  scot.
      --sir w. scott. --t. hughes.

   upside down. perhaps a corruption of oe. up so down,
      literally, up as down. with the upper part undermost;
      hence, in confusion; in complete disorder; topsy-turvy.
      --shak.
      1913 webster

            these that have turned the world upside down are
            come hither also.                     --acts xvii.
                                                  6.
      1913 webster
see also:
to be upsides with upside down 

[2] : WordNet (r) 2.0

upside
     n : the highest or uppermost side of anything; "put your books
         on top of the desk"; "only the top side of the box was
         painted" syn: top, top side, upper side
see also:
top top side upper side 

Upside >> U Words
Upside, definition of term: Upside
upside_pag1.html

Upside Down >> U Words
Upside Down, definition of term: Upside Down
upside+down_pag1.html

Turn Upside Dow >> T Words
Turn Upside Dow, definition of term: Turn Upside Dow
turn+upside+dow_pag1.html