钻牛角尖 (鑽牛角尖) zuān niújiǎo jiān

zuān niújiǎo jiān set phrase to penetrate into a bull's horn; 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
Domain: Idiom 成语
Notes: (CC-CEDICT '鑽牛角尖')