Pronunciation: (fat'n),[key] —v.t. 1. to make fat.
2. to feed (animals) abundantly before slaughter.
3. to enrich: to fatten the soil; to fatten one's pocketbook. 4. Cards. a. Poker.to increase the number of chips in (a pot).
b. Pinochle.to play a card that scores high on (a trick) expected to be taken by a partner.