the literal event of a hidden dagger being revealed at the end of a map scroll, referring to Jing Ke's attempt to assassinate the King of Qin

“图穷匕见”这个成语出自荆轲刺秦王的历史故事。

a figurative expression used when a hidden plot or malicious intention is finally exposed

谈判进行到最后，他终于图穷匕见，露出了吞并公司的野心。