ㄗㄨㄢㄋㄧㄡˊㄐㄧㄠˇzuānniújiǎo

钻牛角
  1. 比喻費力研究探討無法解決沒有價值問題鑽牛角尖」。 凡事不能鑽牛角」。

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