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tr.v. up·set, up·set·ting, up·sets
1. To cause to overturn; knock or tip over: upset the flowerpot.
a. To disturb the functioning, order, or course of: Protesters upset the meeting by chanting and shouting. See Synonyms at overthrow.
b. To cause (the stomach) to feel ill.
3. To distress or perturb mentally or emotionally: The bad news upset me.
4. (ŭp′sĕt′) To defeat unexpectedly (an opponent favored to win).
5. To make (a heated metal bolt, for example) shorter and thicker by hammering on the end.
n. (ŭp′sĕt′)
1. The act of upsetting or the condition of being upset: the upset of the vase.
a. A disturbance, disorder, or state of agitation: an upset of my routine.
b. A condition of indigestion: a remedy for stomach upset.
3. A game, contest, or election in which the favorite is defeated.
a. A tool used for upsetting; a swage.
b. An upset part or piece.
1. Having been overturned: an upset vase.
2. Exhibiting signs and symptoms of indigestion: an upset stomach.
3. In a state of emotional or mental distress; distraught: upset parents.

[Middle English upsetten, to set up : up-, up- + setten, to set; see set1.]

up·set′ter n.
up·set′ting·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.upsetter - an unexpected winner; someone who defeats the favorite competitor
winner, victor - the contestant who wins the contest
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
2 Regal Serenade Valdivia/Catalno 6-1 Turns back; upsetter? 7 War Diamond JLopez/Block 8-1 Barely lost last 3 Mucha Mezquina Marqez/Wiliamson 5-2 Drops for turf debut 8 Blues Mary Kenedy/Robertsn 8-1 Speed; turf bred 4 Lavina Doyle/Spagnola 6-1 Just missed last couple 9 Snattered Murrill/Correas 9-2 Expecting late run 6 Amazing Annie Emigh/Kirby 15-1 Late surprise possible 1 Angel's Cut Perez/Wiggins 9-2 Needed last; maybe 5 Lillet Felix/Wainwright 15-1 Good at FP; 1st turf 6.
The former Pleck ABC man edged past Sheffield's Hardy, a serial upsetter, 58-57.
THURSDAY LEE "SCRATCH" PERRY An absolute living legend and one of the most important figures in the history of reggae and dub, The Upsetter is at Summerhall tonight.
Dodson (32-8-1, 15 KOs) will be remembered for his showdowns against fellow Liverpudlians Paul Smith and Tony Quigley, as well as fights with former world champion Carl Froch and Derbybased 'Upsetter' Ovill McKenzie.
Rainford Hugh Perry, aka The Upsetter but universally tagged as Lee 'Scratch' Perry, can comfortably claim to be one of the true architects of reggae but more specifically the creator of dub.
The Upsetter is 6-5 to make it three knockouts on the spin, but there is a clear blueprint to beating him and if Matty Askin gets his tactics right he could cause an upset of his own.
law firm of Covington & Burling, (1) had quickly become a "confirmed apple-cart upsetter" (Horne, 1965) and in a very short time had managed to irritate just about everyone he worked with--ship builders, union officials, and his own colleagues in one of the most notoriously "derelict" corners of the federal bureaucracy ("Celler Arraigns Maritime Board," 1961) -even as his housecleaning resulted in a remarkable increase in the Merchant Marine's efficiency and productivity.
The vocals sound uncannily similar to Space Oddity Bowie on strong opener The Upsetter, while Month Of Sundays also has the feel of that era.
Thus to interpret man's work (as a laborer, literary critic, engineer, or whatever) as radically and organically connected with what man is and a whole entity (despite the fact that his consciousness cannot recognize or accept the connection) is the common and revolutionary point of departure both for the interpreter as interpreter and, as Lukacs tried also to show, the proletariat as reinterpreter and upsetter of bourgeois reification.
DOUBLE Geraint desire McKenzie is known as 'The Upsetter' but, in truth, he is no more than a hardy journeyman, he inflicted the latest blow on Maccarinelli's fading career at Liverpool's Olympia on Friday night.