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From 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]