fatten someone/something up
phrasal verb with fatten verb uk/ˈfæt.ən/ us/ˈfæt̬.ən/
使长胖，使长肥;给…育肥
to give an animal or a thin person a lot of food so that they become fatter
These cattle are being fattened up for slaughter. 这些牛在育肥以供屠宰。
humorous You're just trying to fatten me up. 你这是在给我催肥呢。