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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.

Feeders are ranchers who own feedlots where they fatten cattle and sell them to meatpackers.

From The Wall Street Journal • Dec. 24, 2025

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

From Los Angeles Times • Aug. 22, 2025

James Canton spent two years sitting beneath an 800-year-old oak tree near his home in Essex, watching acorns fatten and butterflies land on the massive knurled grey trunk.

From BBC • Jul. 14, 2025

Mountain goats deal with heavy snow, and have a short window of time to fatten up before the thick of winter.

From Seattle Times • May 22, 2024

Adults always want to fatten Alice, even mean adults.

From "On the Far Side of the Mountain" by Jean Craighead George