fatten verb definition in Animal farming topic from the Oxford Advanced Learner's Dictionary

fatten

 verb: Animal farming topic
[transitive, intransitive] fatten (somebody/something) (up) to make somebody/something fatter, especially an animal before killing it for food; to become fatter The piglets are taken from the sow to be fattened for market. She's very thin after her illness—but we'll soon fatten her up.