







北门管钥 is a Chinese idiom (chengyu) meaning “a crucial strategic point”. Especially referring to a vital defensive location or a key position for control. Literally, “North Gate key/latch”.
During the Spring and Autumn period, Qi Zi, a man from the State of Qin, held the key to the northern gate of Zheng's capital. He sent a messenger to Duke Mu of Qin, urging him to attack Zheng.
Duke Mu of Qin ignored the advice of Jian Shu and sent his generals, including Meng Ming Shi, to lead an expedition.
Xian Gao, a merchant from Zheng, discovered their intentions. He pretended to offer gifts and welcome the Qin army, while secretly sending intelligence to his own state.
The State of Jin seized this opportunity to dispatch troops and defeat the Qin army.
Duke Mu of Qin later acknowledged his own error.

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Open the tool →北门管钥 (běi mén guǎn yuè) is a Chinese idiom (chengyu) meaning “a crucial strategic point”.
北门管钥 is pronounced běi mén guǎn yuè in Mandarin Chinese.
Literally, 北门管钥 means “North Gate key/latch”. It is used to mean “a crucial strategic point”.
北门管钥 comes from a classical Chinese story dating back to the modern era. The full story is on this page.
犹北门之管。