n.

1. an unhappy and worried mental state;
   disturbance, perturbation
   
   • there was too much anger and disturbance
   • she didn't realize the upset she caused me
2. the act of disturbing the mind or body;
   derangement, overthrow
   
   • his carelessness could have caused an ecological upset
   • she was unprepared for this sudden overthrow of their normal way of living
3. condition in which there is a disturbance of normal functioning;
   disorder
   
   • the doctor prescribed some medicine for the disorder
   • everyone gets stomach upsets from time to time
4. a tool used to thicken or spread metal (the end of a bar or a rivet etc.) by forging or hammering or swaging;
   swage
5. the act of upsetting something;
   overturn, turnover
   
   • he was badly bruised by the upset of his sled at a high speed
6. an improbable and unexpected victory;
   overturn
   
   • the biggest upset since David beat Goliath

v.

1. disturb the balance or stability of
   
   • The hostile talks upset the peaceful relations between the two countries
2. cause to lose one's composure;
   discompose, untune, disconcert, discomfit
3. move deeply;
   disturb, trouble
   
   • This book upset me
   • A troubling thought
4. cause to overturn from an upright or normal position;
   overturn, tip over, turn over, knock over, bowl over, tump over
   
   • The cat knocked over the flower vase
   • the clumsy customer turned over the vase
   • he tumped over his beer
5. form metals with a swage;
   swage
6. defeat suddenly and unexpectedly
   
   • The foreign team upset the local team

adj.

1. afflicted with or marked by anxious uneasiness or trouble or grief;
   disquieted, distressed, disturbed, worried
   
   • too upset to say anything
   • spent many disquieted moments
   • distressed about her son's leaving home
   • lapsed into disturbed sleep
   • worried parents
   • a worried frown
   • one last worried check of the sleeping children
2. thrown into a state of disarray or confusion;
   broken, confused, disordered
   
   • troops fleeing in broken ranks
   • a confused mass of papers on the desk
   • the small disordered room
   • with everything so upset
3. used of an unexpected defeat of a team favored to win;
   upset(a)
   
   • the Bills' upset victory over the Houston Oilers
4. mildly physically distressed
   
   • an upset stomach
5. having been turned so that the bottom is no longer the bottom;
   overturned, upturned
   
   • an overturned car
   • the upset pitcher of milk
   • sat on an upturned bucket