钻牛角

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, 钻牛角尖

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鑽牛角|钻牛角 [zuān niú jiǎo] ► 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|↑钻牛角尖