钻牛角 (鑽牛角) zuānniújiǎo
zuānniújiǎo
noun
honing 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: Modern Chinese 现代汉语
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Notes: Same as idiom 钻牛角尖 (CC-CEDICT '鑽牛角')