Looking up the idiom dictionary, the explanation of the entry "Peeping at a Leopard in a Tube" is: "There was a great calligrapher Wang Xizhi in the Jin Dynasty, and his son Wang Xianzhi was also a famous calligrapher. It is said that when Wang Xianzhi was a few years old, when he watched his family play cards, he quickly saw a little doorway. Sometimes he can't help but say a word or two about his knowledge, but the adults ignore this unruly child, some ignore him, and some teach him: "Even honest people can spy on leopards and see them from time to time. "The explanation of this entry comes from the Book of Jin. Biography of Wang Xianzhi.
Zhuang Chuo's "Wei Wu Han Wen Ling Ye" is self-explanatory: In the eighth year of Jian 'an, the Ling Yue said: "Although a parliamentarian or a military attache has functions, his virtue is not worthy of being chosen by a county. Therefore, a wise monarch will not be an official without power, reward those who do not fight, pursue the sun for peace, and reward functions when something happens. The commentator's words are like a glimpse of tigers and leopards. "
In this way, Cao Cao, Emperor Wu of Wei, used "Peeping Leopard" earlier than "Book of Jin", so the "intellectual property" of this word should belong to Cao Cao.