拜倒辕门　

◎ 拜倒辕门 bàidǎo-yuánmén

[grovel (fall on one‘s knee,prostrate oneself) before the outer gate of a government office in ancient times] 辕门,这里指军营的门。形容佩服到极点,自愿认输

如风头不佳,不能取胜,那时再拜倒辕门也不为迟。——《镜花缘》