1. n. an infantry soldier. (Military. From the gutteral sound made by a pig, and anyone doing very heavy labor.) Get those grunts out on the field at sunrise!
2. n. a low-ranking or subservient person. (Someone who is likely to utter a grunt because of the discomforts of menial labor.) Let’s hire a grunt to do this kind of work.
3. n. a belch. Does that grunt mean you like my cooking?
4. n. a hardworking student. The grunts got Bs on the test. It was that hard!
5. n. a wrestler. (Possibly in reference to a grunting pig.) Two big grunts wearing outlandish costumes performed for the television cameras.