This expression first started appearing in print during the mid-1800s. It comes from the verb grind, which means to rub a material with force to break it into tiny pieces. People often grind grain, for example.
I was grinding AV Uk Drill
This expression first started appearing in print during the mid-1800s. It comes from the verb grind, which means to rub a material with force to break it into tiny pieces. People often grind grain, for example.