What does it mean to compose a suppressive poem?

What does it mean to compose a poem? The relevant content is as follows:

Source:

"The Book of Songs·Daya·Yi": "In today's times, confusion arises in politics. It subverts virtues and leads to desolation in wine. Although women are Zhan Lecong, Fu Nian Jue Shao, Wang Fu asked the king to overcome the punishment. "Xu Qian of the Eastern Han Dynasty, "Zhonglun Xu Dao": "In the past, when Wu Gong was over ninety, he still stayed up all night, thinking about it. After hearing the instructions, he ordered his ministers to say: "There is no point in abandoning me when I am old, I will be warned day and night!" He also wrote the poem "Yu" to warn himself.

Wei people will think of his virtue and write it as a poem. "Qi'ao" is also called Ruisheng. "

Interpretation: During the Eastern Zhou Dynasty, King Ping's minister Wei Wugong was still worried about state affairs when he was more than ninety years old. He wrote the poem "Yi" to stab the royal family and ask him to warn himself. Later generations often used this poem to praise the loyalty of veterans.

Example sentences:

① His life spanned the Feng River, his virtue was like Qi'ao, he entered the alchemy book and wrote poems. (Liu Kezhuang's "Qinyuanchun·Pingzhang's Birthday on Dingmao" 2596) Here, Duke Wu of Wei is used as a metaphor to flatter Prime Minister Jia Sidao. ② How can one return to old age if he has not tried the six Taoist teachings and written no poems? (Liu Kezhuang's "Shuilongyin·Dingsi's Birthday" 2621) The author wrote this poem when he was seventy-one years old. In the poem, this classic is used to ridicule the argument that he is unwilling to become an official.

"Daya·Yi" is a chapter in the "Book of Songs", the first collection of poems in ancient China. It is said to have been written by Wei Wugong. The whole poem has twelve chapters, the first three chapters have eight lines in each chapter, and the last nine chapters have ten lines in each chapter. The first chapter starts with the relationship between philosophy and foolishness, and then gives advice and advice from both positive and negative aspects. The second chapter points out the importance of seeking talents and establishing virtue.