|1.||[ noun ] (psychology,psychiatry) a state of mental disturbance and disorientation|
|Related terms:||insanity unbalance|
|2.||[ noun ] 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"
|Related terms:||disturbance perturb|