1 a thick substance containing oil used, for example, to make engines run smoothly （用于引擎的）油脂: engine grease 引擎润滑油

2 animal fat that has been made soft by cooking 动物油脂: You'll need very hot water to get all the grease off those pans. 要很热的水才能彻底清除那几个锅里的油垢。