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fat‧ten

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.
These projects simply serve to fatten the pockets of developers.fatten somebody/something ↔ up
phrasal verb
My parents are always trying to fatten me up.