uncontrollable
Runaway horse, a Chinese idiom, is pronounced Tu ō Ji ā ngzhang ī m ǎ, which refers to people who are out of control or things that are out of control. It's from night reading.
Analysis of Idioms
Synonym: Runaway wild horse antonym: bird in cage
The origin of Idioms
Mao Dun's night reading notes: "but because of the way of rambling, the letter is often like a runaway horse, far away from the topic."
Idiom usage
He is as free as a runaway horse.
uncontrollable
The sky is high and the emperor is far away - tiān gāo huáng dì yuǎn
the whole country was in a state of upheaval - hǎi shuǐ qún fēi
spring flower and autumn moon -- seasonal views - chūn huā qiū yuè