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Definitions

fatten

[fat-n] / ˈfæt n /
VERB
grow or make bigger; nourish
Synonyms
STRONGEST
augment broaden build up swell
STRONG
bloat coarsen cram distend expand feed fill increase overfeed plump spread stuff thicken thrive wax
WEAK
gain weight put flesh on put on weight round out
Antonyms
STRONGEST
decrease
STRONG
contract deflate deplete lose shrink
WEAK
thin undernourish

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

They are sold to feedlots that fatten them up before being shipped to slaughterhouses.

From The Wall Street Journal • Apr. 20, 2026

He was a skinny teenager told to go to buy milkshakes to "fatten him up".

From BBC • Nov. 7, 2025

Wilson’s phalaropes feed and fatten up at Mono Lake before their migration to South America.

From Los Angeles Times • Aug. 22, 2025

The Katmai brown bears are famous for standing at Brooks Falls, catching sockeye salmon in their mouths to fatten up for the winter.

From Seattle Times • Sep. 29, 2023

Evidently some wild wag of an oculist set them there to fatten his practice in the borough of Queens, and then sank down himself into eternal blindness or forgot them and moved away.

From " The Great Gatsby" by F. Scott Fitzgerald