upsetter

up·set  (p-st)

v. up·set, up·set·ting, up·sets

v.tr.

1. To cause to turn or tip over; capsize.

2. To disturb the functioning, order, or course of: Protesters upset the meeting by chanting and shouting.

3. To distress or perturb mentally or emotionally: The bad news upset me.

4. To overthrow; overturn: upset a will. See Synonyms at overthrow.

5. (pst) To defeat unexpectedly (an opponent favored to win).

6. To make (a heated metal bolt, for example) shorter and thicker by hammering on the end.

v.intr.

1. To become overturned; capsize.

2. To become disturbed.

n. (pst)

1. The act of upsetting or the condition of being upset.

2. A disturbance, disorder, or state of agitation.

3. A game or contest in which the favorite is defeated.

4.

a. A tool used for upsetting; a swage.

b. An upset part or piece.

adj.

1. Having been overturned; capsized.

2. Exhibiting signs and symptoms of indigestion: an upset stomach.

3. In a state of emotional or mental distress; distraught: upset parents.

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

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up·setter n.

up·setting·ly adv.

Thesaurus

Noun

1.

upsetter - an unexpected winner; someone who defeats the favorite competitor winner, victor - the contestant who wins the contest