音标：['graindstәun]
n. 磨石, 砂轮, 石磨
【机】 磨石
在线英汉词典
grindstone的短语、例句：
grindstone
n
1 stone shaped like a wheel, turned on an axle, against which one holds knives or other tools to sharpen them 砂轮.
2 (idm 习语) keep one´s/sb´s nose to the grindstone => nose1.
grindstone