(upsets, upsetting; past and past participle upset) [with object]
1make (someone) unhappy, disappointed, or worried:the accusation upset her (as adjective upsetting)a painful and upsetting divorce
2knock (something) over:he upset a tureen of soup
3cause disorder in; disrupt:the dam will upset the ecological balance
disturb the digestion of (a person’s stomach):the motion of the boat would upset his stomach
4 (often as noun upsetting) shorten and thicken the end or edge of (a metal bar, wheel rim, or other object), especially by hammering or pressure when heated.