The Collaborative International Dictionary of English v.0.48:

Upset \Up*set"\, v. i.
   To become upset.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Upset \Up"set`\, a.
   Set up; fixed; determined; -- used chiefly or only in the
   phrase upset price; that is, the price fixed upon as the
   minimum for property offered in a public sale, or, in an
   auction, the price at which property is set up or started by
   the auctioneer, and the lowest price at which it will be
   sold.
   [1913 Webster]

         After a solemn pause, Mr. Glossin offered the upset
         price for the lands and barony of Ellangowan. --Sir W.
                                                  Scott.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Upset \Up"set`\, n.
   The act of upsetting, or the state of being upset; an
   overturn; as, the wagon had an upset.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Upset \Up*set"\, v. t.
   1. To set up; to put upright. [Obs.] "With sail on mast
      upset." --R. of Brunne.
      [1913 Webster]

   2.
      (a) To thicken and shorten, as a heated piece of iron, by
          hammering on the end.
      (b) To shorten (a tire) in the process of resetting,
          originally by cutting it and hammering on the ends.
          [1913 Webster]

   3. To overturn, overthrow, or overset; as, to upset a
      carriage; to upset an argument. "Determined somehow to
      upset the situation." --Mrs. Humphry Ward.
      [1913 Webster]

   4. To disturb the self-possession of; to disorder the nerves
      of; to make ill; as, the fright upset her. [Colloq.]
      [1913 Webster]

   5. (Basketwork) To turn upwards the outer ends of (stakes) so
      as to make a foundation for the side of a basket or the
      like; also, to form (the side) in this manner.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

upset
    adj 1: afflicted with or marked by anxious uneasiness or trouble
           or grief; "too upset to say anything"; "spent many
           disquieted moments"; "distressed about her son's leaving
           home"; "lapsed into disturbed sleep"; "worried parents";
           "a worried frown"; "one last worried check of the
           sleeping children" [syn: disquieted, distressed,
           disturbed, upset, worried]
    2: thrown into a state of disarray or confusion; "troops fleeing
       in broken ranks"; "a confused mass of papers on the desk";
       "the small disordered room"; "with everything so upset" [syn:
       broken, confused, disordered, upset]
    3: used of an unexpected defeat of a team favored to win; "the
       Bills' upset victory over the Houston Oilers"
    4: mildly physically distressed; "an upset stomach"
    5: having been turned so that the bottom is no longer the
       bottom; "an overturned car"; "the upset pitcher of milk";
       "sat on an upturned bucket" [syn: overturned, upset,
       upturned]
    n 1: an unhappy and worried mental state; "there was too much
         anger and disturbance"; "she didn't realize the upset she
         caused me" [syn: disturbance, perturbation, upset]
    2: the act of disturbing the mind or body; "his carelessness
       could have caused an ecological upset"; "she was unprepared
       for this sudden overthrow of their normal way of living"
       [syn: upset, derangement, overthrow]
    3: a physical condition in which there is a disturbance of
       normal functioning; "the doctor prescribed some medicine for
       the disorder"; "everyone gets stomach upsets from time to
       time" [syn: disorder, upset]
    4: a tool used to thicken or spread metal (the end of a bar or a
       rivet etc.) by forging or hammering or swaging [syn: upset,
       swage]
    5: the act of upsetting something; "he was badly bruised by the
       upset of his sled at a high speed" [syn: upset, overturn,
       turnover]
    6: an improbable and unexpected victory; "the biggest upset
       since David beat Goliath" [syn: overturn, upset]
    v 1: disturb the balance or stability of; "The hostile talks
         upset the peaceful relations between the two countries"
    2: cause to lose one's composure [syn: upset, discompose,
       untune, disconcert, discomfit]
    3: move deeply; "This book upset me"; "A troubling thought"
       [syn: disturb, upset, trouble]
    4: cause to overturn from an upright or normal position; "The
       cat knocked over the flower vase"; "the clumsy customer
       turned over the vase"; "he tumped over his beer" [syn:
       overturn, tip over, turn over, upset, knock over,
       bowl over, tump over]
    5: form metals with a swage [syn: swage, upset]
    6: defeat suddenly and unexpectedly; "The foreign team upset the
       local team"