

upsets
/ʌpˈsɛts/ /ʌpˈsɛtsɪz/




noun
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.

noun
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.




verb
To defeat unexpectedly.




