no obj.
1- (of an animal, especially a pig) make a low, short guttural sound（动物, 尤指猪）发出呼噜声。
1.1
- (of a person) make a low inarticulate sound resembling this, typically to express effort or indicate assent（人）发出咕噜声, 发出哼声（通常表示用力或赞同）：
Graham grunted and heaved as he helped the masons fit a huge slab of stone into place.
格雷厄姆在帮石匠上一块大石板时因为用力而发出一声闷哼。
1
- a low, short guttural sound made by an animal or a person（动物或人发出的）呼噜声, 哼哼声。
2
- informal, chiefly N. Amer. a low-ranking or unskilled soldier or other worker〈非正式, 主北美〉普通士兵; 普通工作人员：
he went from grunt to senior executive vice-president in less than five years
不到五年他便从一名普通工作人员升至高级执行副总裁
as modifier grunt work.普通工作。
ORIGIN: alteration of ground, from ground man (with reference to unskilled railway work before progressing to lineman).
3
- mass noun informal power, especially that of a motor vehicle〈非正式〉（尤指机动车辆的）动力：
what the big wagon needs is grunt, and the turbo does the business.
大货车需要的是动力, 而提供动力的是涡轮机。
4
- an edible shoaling fish of tropical inshore waters and coral reefs, able to make a loud noise by grinding its teeth and amplifying the sound in the swim bladder石鲈鱼。
4.1
- Family Pomadasyidae: numerous genera and species.石鲈科：众多属, 众多种。
词源
Old English grunnettan, of Germanic origin and related to German grunzen; probably originally imitative.