fatten

UK: /ˈfæt^ən/ US: /ˈfætən/ ,(fat′n)

WordReference Random House Learner's Dictionary of American English © 2025

fat•ten /ˈfætən/   v. 

1. to (cause to) grow fat: [~ + object]
   Certain foods will fatten livestock faster than others.
   [no object]
   The animals fattened and the land produced good crops.

WordReference Random House Unabridged Dictionary of American English © 2025

fat•ten  (fat′n), v.t. 

1. to make fat.
2. Animal Husbandry to feed (animals) abundantly before slaughter.
3. to enrich:
   to fatten the soil; to fatten one's pocketbook.
4. Games [Cards.]
   • [Poker.] to increase the number of chips in (a pot).
   • [Pinochle.] to play a card that scores high on (a trick) expected to be taken by a partner.

v.i. 

5. to grow fat.

• fat + -en¹ 1545–55

fat′ten•a•ble, adj. 
fat′ten•er, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

fatten / ˈfæt^ən/ verb

1. to grow or cause to grow fat or fatter
2. (transitive) to cause (an animal or fowl) to become fat by feeding it
3. (transitive) to make fuller or richer
4. (transitive) to enrich (soil) by adding fertilizing agents

ˈfattening adjective