adjective
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(of a person, predicative only) Angry, distressed, or unhappy.
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(of a stomach or gastrointestinal tract) Feeling unwell, nauseated, or ready to vomit.
noun
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(uncountable) Disturbance or disruption.
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(countable, sports, politics) An unexpected victory of a competitor or candidate that was not favored to win.
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(automobile insurance) An overturn.
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An upset stomach.
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(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.
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(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.
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(basketry) A woven row supporting the foundation rods for the uprights of a basket.
verb
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(transitive) To make (a person) angry, distressed, or unhappy.
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(transitive) To disturb, disrupt or adversely alter (something).
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(transitive) To tip or overturn (something).
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(transitive) To defeat unexpectedly.
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(intransitive) To be upset or knocked over.
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(obsolete) To set up; to put upright.
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To thicken and shorten, as a heated piece of iron, by hammering on the end.
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To shorten (a tire) in the process of resetting, originally by cutting it and hammering on the ends.
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(transitive, basketry) To support with an upset (type of woven row).