Definition of upset

• an unhappy and worried mental state; "there was too much anger and disturbance"; "she didnt realize the upset she caused me"
• 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"
• 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"