Definition of "upset"

upset

/ˈʌpsɛt/

adjective
comparative more upset, superlative most upset
1. (of a person) Angry, distressed, or unhappy.
2. (of a stomach or gastrointestinal tract, referred to as stomach) Feeling unwell, nauseated, or ready to vomit.
noun
countable and uncountable, plural upsets
1. (uncountable) Disturbance or disruption.
2. (countable, sports, politics) An unexpected victory of a competitor or candidate that was not favored to win.
  Quotations
  But it is probably the biggest upset for the away side since Ronnie Radford smashed a famous goal as Hereford defeated Newcastle 2-1 in 1972.
  2011 January 8, Paul Fletcher, “Stevenage 3 - 1 Newcastle”, in BBC‎
  Sanders’s win in Michigan was one of the greatest upsets in modern political history.
  2016 March 9, Harry Enten, “What The Stunning Bernie Sanders Win In Michigan Means”, in FiveThirtyEight‎
3. (automobile insurance) An overturn.
4. An upset stomach.
  Quotations
  "Bob, let's cancel the babysitter. With this upset stomach, I can't go out tonight. / "Try Pepto-Bismol. Hospital tests prove it relieves upsets. And it's great for indigestion or nausea, too!"
  1958 May 12, advertisement, Life, volume 44, number 19, page 110
5. (mathematics) An upper set; a subset (X,≤) of a partially ordered set with the property that, if x is in U and x≤y, then y is in U.
6. (aviation) The dangerous situation where the flight attitude or airspeed of an aircraft is outside the designed bounds of operation, possibly resulting in loss of control.
  Quotations
  The Board determines that the probable cause of this accident was the unfavorable interaction of severe vertical air drafts and large longitudinal control displacements resulting in a longitudinal upset from which a successful recovery was not made.
  1965 June 1, Civil Aeronautics Board, “Synopsis”, in Aircraft Accident Report: Northwest Airlines, Inc., Boeing 720B, N724US, Near Miami, Florida, February 12, 1963‎, retrieved 25 November 2022, page 1
verb
third-person singular simple present upsets, present participle upsetting, simple past and past participle upset
1. (transitive) To make (a person) angry, distressed, or unhappy.
2. (transitive) To disturb, disrupt or adversely alter (something).
3. (transitive) To tip or overturn (something).
  Quotations
  But this argument, which first Anaxagoras and later Eudoxus and certain others used, is very easily upset; for it is not difficult to collect many insuperable objections to such a view.
  1924, W. D. Ross translator, Aristitle, Metaphysics, Book 1, Part 9, The Classical Library, Nashotah, Wisconsin, 2001.
4. (transitive) To defeat unexpectedly.
5. (intransitive) To be upset or knocked over.
  Quotations
  [T]he locomotive exploded and upset, and was completely wrecked.
  1880 January 1, The Locomotive, volume 1, number 1, Hartford, Conn.: The Hartford Steam Boiler Inspection And Insurance Company, page 9
6. (obsolete) To set up; to put upright.
  Quotations
  with sail on mast upset
  R. of Brunne
7. To thicken and shorten, as a heated piece of iron, by hammering on the end.
8. To shorten (a tire) in the process of resetting, originally by cutting it and hammering on the ends.

Definition of "upset"

upset

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