up•setʌpˈsɛt; ˈʌpˌsɛt(v., adj.; n.; v.; adj.)-set, -set•ting

1. (v.t.)to overturn:

   to upset a glass of milk.

2. to disturb mentally or emotionally; distress:

   The accident upset her.

3. to disturb completely; throw into disorder:

   to upset a plan.

4. to disturb physically.

   Category: Pathology

5. to defeat (an opponent that is favored), as in politics or sports.

6. (v.i.)to become upset or overturned.

7. (n.)an upsetting or instance of being upset; overturn; overthrow.

8. the unexpected defeat of an opponent that is favored.

9. a nervous, irritable state of mind.

10. a disturbance or disorder.

11. (adj.)overturned.

12. disordered; disorganized.

13. distressed; disturbed.

Origin of upset:

1300–50

up•set′ter(n.)