fat

American  

[fat] / fæt /

adjective

• fatter,
  comparative
• fattest
  superlative

1. having too much flabby tissue; corpulent; obese.

   a fat person.

   Synonyms:

   pudgy, adipose, portly

   Antonyms:

   thin

2. plump; well-fed.

   a good, fat chicken.

3. consisting of or containing fat; greasy; oily.

   fat gravy; fat meat.

   Synonyms:

   fatty, unctuous

   Antonyms:

   lean

4. profitable, as an office.

   a fat job on the city commission.

   Synonyms:

   remunerative, lucrative

5. affording good opportunities, especially for gain.

   a fat business contract.

6. wealthy; prosperous; rich.

   He grew fat on dishonest profits.

7. big, broad, or extended; thick.

   a fat sheaf of bills.

8. plentiful; abundant.

   a fat supply of food.

   Synonyms:

   copious

9. plentifully supplied.

   a fat larder; a fat feast.

10. dull; stupid.

    fat clumsiness of manner.

    Synonyms:

    sluggish

    Antonyms:

    clever

11. abounding in a particular element.

    Fat pine is rich in resin.

12. (of paint) having more oil than pigment.

13. (of coal) highly bituminous; rich in volatile hydrocarbons.

14. Ceramics. long.

15. fertile, as land.

    Everything grows in this fat soil.

    Synonyms:

    productive, fruitful, rich

    Antonyms:

    barren, sterile

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noun

• fats
  plural

1. any of several white or yellowish greasy substances, forming the chief part of adipose tissue of animals and also occurring in plants, that when pure are colorless, odorless, and tasteless and are either solid or liquid esters of glycerol with fatty acids; fats are insoluble in water or cold alcohol but soluble in ether, chloroform, or benzene: used in the manufacture of soap, paints, and other protective coatings and in cooking.

2. animal tissue containing much of this substance; loose flesh; flabbiness.

   to have rolls of fat around one's waist.

3. the richest or best part of anything.

4. obesity; corpulence.

   In his later years, he inclined to fat.

5. Slang. especially profitable or advantageous work.

6. an overabundance or excess; superfluity.

7. action or lines in a dramatic part that permit an actor to display abilities.

8. Also called lift.  Typesetting. Also matter that can be composed easily and profitably, especially from standing type, illustrations, or the like.

   fat work.

verb (used with or without object)

• fats,
  present (3rd person singular)
• fatted,
  past participle,  past
• fatting
  present participle

1. to make or become fat.

idioms

1. chew the fat. chew.

2. the fat of the land, the best or richest of anything obtainable.

   to live on the fat of the land.

3. a fat chance, a very slight chance; small probability.

   A fat chance he has of winning the title!

4. the fat is in the fire,

   1. an irrevocable action or chain of events has been started; the die is cast.

      Now that they have been given an ultimatum, the fat is in the fire.

   2. the decision, whether good or bad, has been made.

   3. the crisis is imminent.

5. a fat lot, little or not at all.

   A fat lot they care about anyone else's troubles!

fat British  

/ fæt /

noun

1. any of a class of naturally occurring soft greasy solids that are esters of glycerol and certain fatty acids. They are present in some plants and in the adipose tissue of animals, forming a reserve energy source, and are used in making soap and paint and in the food industry See also oil

2. vegetable or animal tissue containing fat

3. corpulence, obesity, or plumpness

4. the best or richest part of something

5. a part in a play that gives an actor a good opportunity to show his talents

6. slang

   1. to argue over a point

   2. to talk idly; gossip

7. an irrevocable action has been taken, esp one from which dire consequences are expected

8. the best that is obtainable

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adjective

1. having much or too much flesh or fat

2. consisting of or containing fat; greasy

   fat pork

3. profitable; lucrative

   a fat year

4. affording great opportunities

   a fat part in the play

5. fertile or productive

   a fat land

6. thick, broad, or extended

   a fat log of wood

7. having a high content of a particular material or ingredient, such as resin in wood or oil in paint

8. plentifully supplied

   a fat larder

9. slang empty; stupid

   get this into your fat head

10. slang very little or none; minimal (in phrases such as a fat chance , a fat lot of good , etc)

verb

1. to make or become fat; fatten

fat Scientific  

/ făt /

1. Any of a large number of oily compounds that are widely found in plant and animal tissues and serve mainly as a reserve source of energy. In mammals, fat, or adipose tissue, is deposited beneath the skin and around the internal organs, where it also protects and insulates against heat loss. Fat is a necessary, efficient source of energy. An ounce of fat contains more than twice as much stored energy as does an ounce of protein or carbohydrates and is digested more slowly, resulting in the sensation of satiety after eating. It also enhances the taste, aroma, and texture of food. Fats are made chiefly of triglycerides, each molecule of which contains three fatty acids. Dietary fat supplies humans with essential fatty acids, such as linoleic acid and linolenic acid. Fat also regulates cholesterol metabolism and is a precursor of prostaglandins.

2. See more at saturated fat unsaturated fat

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fat More Idioms  

More idioms and phrases containing fat

• chew the fat
• kill the fatted calf

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Usage

What is a basic definition of fat? Fat is commonly used as a way to describe someone as obese or overweight. This is most often used in a critical, judgmental, or mean way. In contrast, words like obese and overweight are more often used in a neutral way, such as in a medical context in the discussion of a person’s health (though they too can be used in a judgmental or mean way). This sense of fat isn’t always used in a negative way. Some people might call others or themselves fat in a way that’s not intended to be critical, as in I’m fat and I’m fabulous and all the body-shamers will just have to deal with it. Sometimes, people replace the word fat with words intended to be more polite or euphemistic, such as heavy, heavyset, plump, and chubby. However, these words still focus on a person’s weight or appearance in a way that can be demeaning or objectifying. As a noun, fat refers to the greasy substance that forms some types of tissue in the body of humans and animals (some of which the body stores and uses for energy) and some plants. The word is often used more casually to refer to a person’s excess flesh, as in belly fat.  In the context of nutrition, fat refers to this kind of substance in the foods we eat. Foods from animals, such as meat, milk, and eggs, all contain fat. But so do some plant-based foods, such as nuts, avocados, and olive oil. However, there are different kinds of fat, such as saturated fat, unsaturated fat, and trans-fat, each of which can have different effects on a person’s nutrition and health. In general, it’s usually recommended not to consume too much fat. However, some fats are necessary in a diet because they help the body to absorb vitamins. The nutrition label on food products usually tell you exactly how much fat and what kinds of fats are in them. The word fat is common and has many other meanings as an adjective, a noun, and even a verb. Example: This diet is based on avoiding foods that are high in fat.  

Synonym Usage

See stout.

Other Word Forms

Derived Forms

• fatness
  noun
• defat
  verb (used with object)
• fatless
  adjective
• fatlike
  adjective
• fattish
  adjective
• overfat
  adjective
• unfatted
  adjective
• fatly
  adverb

Inflected Forms

Nouns

• fats
  plural

Adjectives

• fatter
  comparative
• fattest
  superlative

Participles

• fatting
  present
• fatted
  past

Conjugated Forms

Present

• fat
  simple
• fats
  simple
• have fatted
  perfect
• has fatted
  perfect
• am fatting
  progressive
• are fatting
  progressive
• is fatting
  progressive
• have been fatting
  perfect progressive
• has been fatting
  perfect progressive

Past

• fatted
  simple
• had fatted
  perfect
• was fatting
  progressive
• were fatting
  progressive
• had been fatting
  perfect progressive

Future

• will fat
  simple
• will have fatted
  perfect
• will be fatting
  progressive
• will have been fatting
  perfect progressive

Etymology

Origin of fat

First recorded before 1000; Middle English; Old English fǣtt, originally the past participle of fǣtan “to cram, load, adorn”; cognate with Gothic fētjan “to adorn”; akin to vat

Explanation

Fat is a form of body tissue on animals. It’s a squishy layer that stores energy and protects organs. Fat is also an adjective meaning chubby or thick, as in a fat piglet or a fat wallet full of money. Some foods, like butter or avocado, have fat. Deep fried chocolate bars have a lot of fat. Humans, and other animals, need to consume some fat to maintain optimal health and absorb certain vitamins. The word fat can be applied not just to people, animals, or deep-fried food, but to any inanimate object that is notably big. Your brother likes reading comics, while you prefer fat books like War and Peace and The Complete Works of Shakespeare.

Example Sentences

See Examples For:

fat fats fatter fattest fatted fatting

To explore how the protein influences appetite and body weight, the animals were given free access to soybean oil as a source of dietary fat.

From Science Daily ● Aug. 13, 2026

People with metabolic syndrome, a cluster of risk factors that includes high blood pressure, raised blood sugar and excess body fat, may see particular benefits.

From Science Daily ● Aug. 13, 2026

“Big Short” investor Michael Burry, wrote that he has feared any successor to Buffett would be “too old,” and have no patience for “the fat pitch,” in reference to Abel.

From MarketWatch ● Aug. 10, 2026

He got a fat bonus from the company’s blockbuster 2025, which dovetailed with his wedding day late last year.

From The Wall Street Journal ● Aug. 10, 2026

Her body was warm and her head was as fat and floaty as a cloud.

From "Nim’s Island" by Wendy Orr

Some cosmetics, medicines and supplements contain gelatin, animal fats, alcohol or other ingredients whose origins matter to observant consumers.

From MarketWatch ● Aug. 12, 2026

Takeaways high in fats, salt and sugar are more widely available in areas of high deprivation where people are at higher risk of obesity.

From BBC ● Aug. 7, 2026

After an episode filled with warnings about addiction, government deception, processed food and discredited fats, the meal itself receives one adjective and one bite.

From Salon ● Aug. 5, 2026

Probiotic frozen yogurts, which contain healthy fats and more protein than other versions, align with the types of high-protein diets that have taken off with the boom in GLP-1 weight-loss medications.

From The Wall Street Journal ● Jul. 19, 2026

For example, they have higher levels of polyunsaturated fats instead of monounsaturated fats.

From "The Omnivore's Dilemma" by Michael Pollan

I never became “unrecognizable,” and I spent more time than I’d like to admit looking at myself in the mirror and comparing what I saw to photos of the younger, fatter version of myself.

From Los Angeles Times ● Aug. 12, 2026

Boosting isn’t a solution, but it is an equalizer, reminding upper management that a different title and fatter salary don’t exempt them from compassion, inside or outside the store.

From Salon ● May 22, 2026

With fatter profit margins from AI, earnings can grow 14% annually through 2027.

From Barron's ● Mar. 10, 2026

SNPs have even fatter profit margins than traditional Medicare Advantage plans.

From MarketWatch ● Mar. 6, 2026

In the last few days the poor beast had improved wonderfully; it already seemed fatter and stronger, and had begun to show an affection for its new masters, especially for Sam.

From "The Fellowship of the Ring" by J.R.R. Tolkien

“It’s the early Christian that gets the fattest lion.”

From MarketWatch ● Jul. 24, 2026

This is partly why she pursued the research: She wanted to figure out what characterizes the few with the fattest paychecks.

From The Wall Street Journal ● Apr. 30, 2026

“America has now become the fattest nation in the world. Congratulations,” a voice narrates.

From New York Times ● May 12, 2024

And second, Sgr A* isn't even the fattest hole we've seen.

From Salon ● Mar. 28, 2024

"But Igor Barkov has offered to trade his fattest pig for her. I can't compete with that."

From "Holes" by Louis Sachar

Finally, with the infrastructure in place and the new money flowing, the Dodgers then opened their fatted wallet for the players that created the championship.

From Los Angeles Times ● Dec. 4, 2024

The film also captures a tradition that would soon disappear from New Orleans Mardi Gras — the “boeuf gras,” or fatted ox, paraded around the city.

From New York Times ● Jun. 23, 2022

You were the good and prudent child, and now you’re glumly getting ready for the fatted calf to be slaughtered for your useless brother.

From Slate ● Feb. 22, 2019

He tried this flop shot from there and kind of fatted it and came up short.

From Golf Digest ● Apr. 4, 2017

‘And we’ll kill the fatted calf—you long-lost whatever-you-are. Come an hour after candles are lit. Prodigal Son, what? Got a cup, has he?’

From "Johnny Tremain" by Esther Hoskins Forbes

"I had three weeks off after the US Open and you probably saw a little bit on Thursday I was fatting a few shots," said Hatton.

From BBC ● Jul. 14, 2023

Even when steep swingers hit it solid, they take deep divots—they're always on the verge of fatting it.

From Golf Digest ● Mar. 13, 2017

In this predicament we wintered about 1,000 half-bred lambs, more than 400 ewes, and some fatting sheep.

From The Stock-Feeder's Manual the chemistry of food in relation to the breeding and feeding of live stock by Sir Charles Alexander Cameron

He is nearly always killing pigs; sometimes beating the oak for them; with Spenser, fatting them.

From The Stones of Venice, Volume II (of 3), by John Ruskin

Amongst these ideas which the old-fashioned ones looked upon as fads, was that of feeding pigs of all ages and especially fatting pigs on a certain proportion of vegetable food.

From The Pig Breeding, Rearing, and Marketing by Sanders Spencer

Related Words

• big
• bulging
• bulky
• chunky
• heavy
• hefty
• inflated
• large
• meaty
• obese
• plump
• well-fed