磨刀石

whetstone (for honing knives)

to rub / to grind / to polish / to sharpen / to wear down / to die out / to waste time / to pester / to insist

grindstone / to grind / to turn round

to hone (a knife)

knife / blade / single-edged sword / cutlass / CL:把[ba3] / (slang) dollar (loanword) / classifier for sets of one hundred sheets (of paper) / classifier for knife cuts or stabs

surname Shi / abbr. for Shijiazhuang 石家莊|石家庄[Shi2 jia1 zhuang1]

dry measure for grain equal to ten dou 斗 / ten pecks / one hundred liters

rock / stone / stone inscription / one of the eight categories of ancient musical instruments 八音[ba1 yin1]

dry measure for grain equal to ten dou 斗[dou3]; one hundred liters / ancient pr. [shi2]

whetstone (for honing knives)