1 pound, powder, pulverize, abrade, crush, granulate, mill, grate, rasp, crumble, kibble, mash, triturate, bray, comminute:
The rock was soon ground to a fine powder.
2 sharpen, whet; file, smooth, polish:
He is grinding the edge to be razor sharp.
3 gnash, grit, grate:
He grinds his teeth when he's angry.
4 Also, grind away. labour, toil, slave (away); study, lucubrate, burn the midnight oil, Colloq cram, Brit swot:
George has been grinding away at the same job all his life. Languages came easily, but he had to grind away at the sciences.
5 grind down. wear down or away, crush, oppress, subdue, suppress, tyrannize, persecute, maltreat, ill-treat, harry, harass, hound, hector, plague, badger:
Dictators first grind down all opposition, then destroy it.
6 grind out. produce, generate, crank out, churn out, turn out:
For 20 years he has been grinding out the daily gossip column.
7 toil, labour, drudgery, travail, exertion, task, chore:
Working at the checkout counter hour after hour is a terrible grind.