1 disturb, agitate, distress, unsettle, put off, put out, perturb, disquiet, fluster, ruffle, frighten, scare, disconcert, dismay, trouble, worry, bother, discompose, make (someone) nervous:
We once had a nanny who told the children horror stories just to upset them.
2 overturn, capsize, topple, up-end, tip over, knock over or down, invert, turn topsy-turvy or upside down, spill:
That is the third time this week you have upset the cream jug.
3 disturb, derange, disrupt, disarrange, mess up, disorganize, snarl up, jumble, muddle, Colloq Brit kerfuffle or carfuffle or kurfuffle:
The boys upset the entire house with their horseplay.
4 overthrow, defeat, beat, worst, thrash, rout, conquer, overcome, win out over, get the better of, get or gain the advantage over, triumph over, be victorious over, vanquish:
The question is whether the challenger will upset the champion in the Wimbledon finals.
5 defeat, ruin, spoil, thwart, interfere with, destroy, demolish, mess up, disturb, Colloq throw a Brit spanner in(to) or US monkey wrench into (the works), US discombobulate, Slang screw up, gum up, put the kibosh on, Taboo Slang fuck up, Brit bugger up:
Your coming early upset my plan to shampoo my hair.
6 capsized, overturned, upside down, bottom side up, inverted, reversed, toppled, tipped over, topsy-turvy:
We clung to the bottom of the upset boat till help arrived.
7 sick, queasy:
Eve has an upset stomach and cannot go.
8 perturbed, disturbed, disquieted, disconcerted, agitated, distressed, worried, troubled, unnerved, distracted, apprehensive, nervous, frightened, scared, afraid:
We found Valdimir in a terribly upset state at Natasha's disappearance.
9 disordered, confused, disorganized, messed-up, jumbled, muddled, disturbed, disarranged:
The house is never so upset as after a party.
10 angry, irate, furious, beside oneself, mad, Colloq fit to be tied, Slang freaked out:
Father was upset because I took the car without his permission.
11 defeat, upsetting, conquest, overthrow, rout, thrashing, triumph, victory:
We celebrated the upset of Queen's Park Rangers by Manchester United.
12 surprise, unexpected event or occurrence:
The upset of the season was when Carridoff won the Derby.