南辕北辙

nányuán-běizhé

(1) [try to go south by driving the chariot north-act in a way that defeats one's purpose]∶与事实相反, 背道而驰

使南辕北辙, 无苦征途。 --《福惠全书》

(2) [poles apart, poles asunder]∶截然相反