upset

American  

[uhp-set, uhp-set] / ʌpˈsɛt, ˈʌpˌsɛt /

verb (used with object)

upset, upsetting

1. to overturn.

   to upset a pitcher of milk.

2. to disturb mentally or emotionally; perturb.

   The incident upset her.

   Synonyms:

   fluster, disconcert, unnerve

   Antonyms:

   steady

3. to disturb or derange completely; put out of order; throw into disorder.

   to upset a system; to upset a mechanism; to upset an apartment.

   Antonyms:

   steady

4. to disturb physically.

   It upset his stomach.

5. to defeat or overthrow an opponent that is considered more formidable, as in war, politics, or sports.

   Synonyms:

   displace, depose

6. Metalworking. to thicken the end of (a piece of heated metal) by hammering on the end against the length of the piece.

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verb (used without object)

upset, upsetting

1. to become upset or overturned.

noun

1. an upsetting or instance of being upset; overturn; overthrow.

2. the defeat of a person, team, etc., that is considered more formidable.

3. a nervous, irritable state of mind.

   Synonyms:

   disturbance, perturbation

4. a disordered or confused arrangement.

   Synonyms:

   mess

5. Metalworking.

   1. a tool used for upsetting.

   2. something that is upset, as a bar end.

adjective

1. overturned.

   an upset milk pail.

2. disordered; disorganized.

   The house is upset.

3. distressed; disturbed.

   She had an upset stomach. He is emotionally upset.

   Synonyms:

   annoyed, agitated, disconcerted

4. Archaic. raised up.

upset British  

verb

1. (also intr) to tip or be tipped over; overturn, capsize, or spill

2. to disturb the normal state, course, or stability of

   to upset the balance of nature

3. to disturb mentally or emotionally

4. to defeat or overthrow, usually unexpectedly

5. to make physically ill

   seafood always upsets my stomach

6. to thicken or spread (the end of a bar, rivet, etc) by forging, hammering, or swagging

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noun

1. an unexpected defeat or reversal, as in a contest or plans

2. a disturbance or disorder of the emotions, body, etc

3. a tool used to upset a bar or rivet; swage

4. a forging or bar that has been upset in preparation for further processing

adjective

1. overturned or capsized

2. emotionally or physically disturbed or distressed

3. disordered; confused

4. defeated or overthrown

Related Words

Upset, capsize, overturn imply a change from an upright or other stable position to a prostrate one. Upset is a familiar word, applied to simple, everyday actions: to upset a table, a glass of water. Capsize is applied especially to the upsetting of a boat or other vessel: to capsize a canoe. Overturn usually suggests violence in upsetting something supposedly stable: The earthquake overturned houses. All three are used figuratively, also: to upset the stock market; to capsize a plan; to overturn a government.

Other Word Forms

• unupset
  adjective
• unupsettable
  adjective
• upsettable
  adjective
• upsetter
  noun
• upsetting
  adjective
• upsettingly
  adverb

Etymology

Origin of upset

First recorded in 1300–50; Middle English: “raised up”; see up-, set

Explanation

To be upset is to be disturbed or very unhappy. You can be upset, and you can also upset someone — but you probably didn’t mean to. Upset has multiple senses. It generally refers to something that has been knocked over, turned upside down, or disturbed. Just as your coffee cup can be upset — knocked over or disturbed –- so can your emotions –- and your stomach. Upset can also refer to an unexpected victory. You might be so upset by the upset of your favorite team that you upset your table in frustration.

Example Sentences

Posting a tribute on Facebook last week, his family said they were devastated and "words simply can't describe the heartbreak and upset we're going through".

From BBC • May 19, 2026

Leerink Partners downgraded Regeneron to Market Perform from Outperform, citing the latest trial upset as well as “Eylea erosion risk.”

From Barron's • May 18, 2026

The teenagers are believed to have upset their employer.

From Los Angeles Times • May 17, 2026

Those cheat codes are now on the brink of powering soccer’s greatest upset since Leicester City defied 5,000-to-1 odds to win the Premier League a decade ago.

From The Wall Street Journal • May 15, 2026

The one thing I cannot do is upset them further.

From "The Brightwood Code" by Monica Hesse

Related Words

• agitate
• bewilder
• dismay
• distract
• disturb
• perturb
• unnerve
• unsettle