fat ‧ ten /ˈfætn/ BrE AmE verb
[ Word Family: adjective : ↑ fat , ↑ fattening , ↑ fatty , ↑ fatted ; noun : ↑ fat , ↑ fatty ; verb : ↑ fatten ]
1 . [intransitive and transitive] to make an animal become fatter so that it is ready to eat, or to become fat and ready to eat
2 . [transitive] to make an amount larger:
These projects simply serve to fatten the pockets of developers.
fatten somebody/something ↔ up phrasal verb
to make a person or animal fatter:
My parents are always trying to fatten me up.