Source : Webster's Revised Unabridged Dictionary (1913)
Upside \Up"side`\, n.
The upper side; the part that is uppermost.
{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.
These that have turned the world upside down are
come hither also. --Acts xvii.
6.
Source : WordNet®
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}]