磨损

to suffer wear and tear; to deteriorate through use; to wear out

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 decrease; to lose / to damage; to harm / (coll.) to ridicule; to deride / (coll.) caustic; sarcastic; nasty; mean / one of the 64 hexagrams of the Book of Changes: ䷨