The word "grunt" typically means making a low, rough sound like a pig or expressing one's dissatisfaction or annoyance with a short, deep sound. Full definition
If the old model was, a lawyer comes out of law school and joins a firm, does a lot of grunt work in the first few years to not only sort of learn how to research, but learn how to think like a lawyer and learn how to really work for that firm and for a client; that model may be shifting more and more to lawyers going straight to in - house counsel, where they don't get the first couple of years of law firm training. (legaltalknetwork.com)
Companies were willing to take on interns as a sort of community service as well as to get some of grunt work done for free. (inc.com)
Combining smoothly with the auto transmission, the oiler delivered a strong, linear surge across the rev range as well as relaxed performance around town, with enough grunt in the wet or dry to spin the front wheels in lower gears. (motoring.com.au)