achilles heel
致命弱点；要害部位
书面语·比喻·形容致命弱点
英文释义
a weakness or vulnerable point
例句
His temper is his achilles heel in negotiations.
典故来源
源自希腊神话，英雄阿喀琉斯被母亲握住脚踵浸入冥河，全身刀枪不入，唯脚踵是致命弱点。