render something down
phrasal verb with render verb [ T ] uk/ˈren.dər/ us/ˈren.dɚ/
food & drink, engineering specialized将（脂肪）熬成油;熬炼;熬化
to melt fat in order to make it purer
food & drink, engineering specialized从（动物尸体中）取出脂肪（或其他物质）;对（动物尸体）开膛切割
to prepare or treat the bodies of dead animals in order to take out the fat and other substances that can be used in other products
to render down animal carcasses 将动物尸体开膛取出脂肪