My knees are as iron as iron
My knee is like iron. It is a Chinese idiom. Its pinyin is w ú x ī R ú Ti ě, which means that it is a metaphor for being strong and unyielding. It comes from the biography of Li Qi in Yuan history.
The origin of Idioms
Biography of Li Qi in the history of Yuan Dynasty: "my knees are as iron as iron. How can I bend for thieves?"
Idiom explanation
It refers to being strong and unyielding.
My knees are as iron as iron
be adept with both the pen and the sword - wén wǔ shuāng quán
a woman hysterically shouting and cursing in public - pō fù mà jiē