upset
Disturbance or disruption.
My late arrival caused the professor considerable upset.
An unexpected victory of a competitor or candidate that was not favored to win.
(automobile insurance) An overturn.
"collision and upset": impact with another object or an overturn for whatever reason.
An upset stomach.
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.
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.