To reduce something to small particles or powder by crushing it. She used a mortar and pestle to grind the spices into a fine powder.
To work or study hard and persistently. She had to grind for hours to prepare for her final exams.
To rub or cause to rub together harshly; to grate. The gears began to grind as the machine malfunctioned.
To dance in a sexually suggestive manner. The couple started to grind on the dance floor as the music played.
To hone, sharpen, or smooth a surface or edge by friction. The blacksmith ground the blade to a razor-sharp edge.