鑽牛角 [ㄗㄨㄢ ㄋㄧㄡˊ ㄐㄧㄠˇ; zuan1 niu2 jiao3] lit. honing a bull's horn; fig. to waste time on an insoluble or insignificant problem to bash one's head against a brick wall a wild goose chase a blind alley to split hairs same as idiom 鑽牛角尖 ◄ ►