钻牛角

1. • lit. honing a bull's horn fig. to waste time on an insoluble or insignificant problem
2. • to bash one's head against a brick wall
3. • a wild goose chase
4. • a blind alley
5. • to split hairs
6. • same as idiom 钻牛角尖

Character by character

• 钻(zuān)drill
• 牛(niú)surname Niu
• 角(jiǎo)angle