What comes to mind when I say the word grind?
For me, the first thing that comes to mind is grinding something up; like a pepper grinder putting some fresh ground pepper on a juicy sirloin. I certainly like the thought of that!
Maybe you thought of grind as a sound. If you’ve ever driven a car with manual transmission, and you miss a shift, you’ll hear a grinding sound. Not pleasant, and not good for the car either.
Another thought that comes to mind is the feeling that, “work was such a grind today”. It connotes things didn’t go well, or it was hard, or it was long. Looking at it in this context definitely gives the word grind a negative feeling.