transitive verb ground, grinding grind′·ing

1. 1. to crush into bits or fine particles between two hard surfaces; pulverize
   2. to chop into small pieces or fine particles by means of sharp metal blades to grind coffee beans
2. to afflict with cruelty, hardship, etc.; crush; oppress a people ground by tyranny
3. to sharpen, shape, or smooth by friction
4. to press down or together with a crushing, turning motion; rub harshly or gratingly to grind one's teeth
5. to operate by turning the crank of to grind a coffee mill
6. to make or produce by grinding

Etymology: ME grinden < OE grindan < IE *ghrendh < base *ghren-, to rub away, pulverize > ground

intransitive verb

1. to perform the act of grinding something
2. to be capable of being ground; undergo grinding
3. to grate
4. Informal to work or study hard and steadily
5. ☆ Slang to move the hips in a circular motion, as in striptease dancing

noun

1. the act or operation of grinding
2. the degree of fineness of something ground into particles
3. long, difficult, tedious work or study; drudgery
4. ☆ Informal a student who studies very hard
5. ☆ Slang a circular movement of the hips made by or as by a striptease dancer