Definitions
1.verbTo make (a person) angry, distressed, or unhappy."I’m sure the bad news will upset him, but he needs to know."
2.verbTo disturb, disrupt or adversely alter (something)."Introducing a foreign species can upset the ecological balance."
3.verbTo tip or overturn (something).
4.verbTo defeat unexpectedly."Truman upset Dewey in the 1948 US presidential election."
5.verbTo be upset or knocked over."The carriage upset when the horse bolted."
6.verbTo set up; to put upright.
7.verbTo thicken and shorten, as a heated piece of iron, by hammering on the end.
8.verbTo shorten (a tire) in the process of resetting, originally by cutting it and hammering on the ends.
9.nounThe action of the verb upset.
10.adjectiveCausing upset; distressing."He found taking his cat to the vet to be put down very upsetting."
11.adjectiveConceited; presumptuous.