n.[C]

1. 磨石；砂輪
   He's got to keep his nose to the grindstone to feed his six children.

   他得一刻不停拼命做才能養活他那六個孩子。

2. 石磨

n.

1. a thick revolving disc of abrasive material used for sharpening or polishing metal objects.
2. a millstone.