A rat goes into a bull's horn
As a Chinese idiom, the Pinyin is sh ǔ R ù Ni ú Ji ǎ o, which means that the power of metaphor is getting smaller and smaller. It comes from Liu Fen, a Southern Han family in the history of the new Five Dynasties.
The origin of Idioms
"New history of the Five Dynasties · Southern Han family · Liu Fen": "why my descendants are unworthy, later generations are like a rat into the horn of an ox, the potential should be gradually smaller!"
Idiom usage
As an object or attribute; used in figurative sentences.
Examples
A weak apprentice's code may cause danger, but it will inevitably lead to a situation where a rat will enter a bull's horn. Wang Tao, Qing Dynasty
A rat goes into a bull's horn
sit facing each other in silence - xiāng duì wú yán