Definition of "Upset" :

noun: an improbable and unexpected victory

"The biggest upset since David beat Goliath."

noun: the act of upsetting something

"He was badly bruised by the upset of his sled at a high speed."

noun: the act of disturbing the mind or body

"His carelessness could have caused an ecological upset."

noun: a tool used to thicken or spread metal (the end of a bar or a rivet etc.) by forging or hammering or swaging

noun: a physical condition in which there is a disturbance of normal functioning

"Everyone gets stomach upsets from time to time."

noun: an unhappy and worried mental state

"She didn't realize the upset she caused me."

verb: disturb the balance or stability of

"The hostile talks upset the peaceful relations between the two countries."

verb: defeat suddenly and unexpectedly

"The foreign team upset the local team."

verb: form metals with a swage

verb: move deeply

"This book upset me."

verb: cause to lose one's composure

verb: cause to overturn from an upright or normal position

adjective: used of an unexpected defeat of a team favored to win

"The Bills' upset victory over the Houston Oilers."

adjective: thrown into a state of disarray or confusion

"With everything so upset."

adjective: afflicted with or marked by anxious uneasiness or trouble or grief

"Too upset to say anything."

adjective: having been turned so that the bottom is no longer the bottom

"The upset pitcher of milk."

adjective: mildly physically distressed

"An upset stomach."