Meaning of “fat” in the English Dictionary

"fat" in British English

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fatadjective

uk /fæt/ us /fæt/ fatter, fattest

fat adjective (BIG)

A1 having a lot of flesh on the body:

Like most women, she thinks she's fat.
I hate my fat thighs.
He eats all the time but he never gets fat.

thick or large:

He passed me a fat envelope full of money.
Some producers of mineral water have made fat profits.

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Idiom(s)

fatnoun

uk /fæt/ us /fæt/

[ U ] the substance under the skin of humans and animals that stores energy and keeps them warm:

body fat
Women have a layer of subcutaneous fat (= fat under the skin), which provides them with better insulation than men.

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(Definition of “fat” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"fat" in American English

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fatadjective [ -er/-est only ]

us /fæt/ -tt-

fat adjective [ -er/-est only ] (FLESHY)

having a lot of flesh on the body:

Her weight’s normal but she insists she’s fat.

Fat can also mean thick or big:

fat adjective [ -er/-est only ] (WEALTHY)

infml having or worth a lot of money:

a fat profit

Idiom(s)

fatnoun [ C/U ]

us /fæt/

fat noun [ C/U ] (SUBSTANCE)

biology the substance under the skin of humans and animals that stores energy and keeps them warm

Fat is also a solid or liquid substance obtained from animals or plants and used esp. in cooking.

(Definition of “fat” from the Cambridge Academic Content Dictionary © Cambridge University Press)