北门之管的成语故事

拼音běi mén zhī guǎn

基本解释管：钥匙。表示军事要地或守御重任。

出处先秦 左丘明《左传 僖公三十二年》：“杞子自郑使告于秦曰：‘郑人使我掌其北门之管，若潜师以来，国可得也。’”杜预注：“管，钥也。”

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北门之管的典故

春秋时期，秦国人杞子在郑国掌握了都城北门的钥匙，派人要秦穆公攻打郑国。秦穆公不听蹇叔的劝告，派大将孟明视等率军出征。郑国商人弦高发现，假装送礼迎接秦军，背后通风报信。晋国乘机出兵打败秦军。秦穆公承认是他的罪过。