be so dark that nothing is discernible
It's a Chinese idiom. Pinyin is h ē ITI ā nm ō D ì, which means it's too dark to see anything. From the outlaws of the marsh.
The origin of Idioms
In the 87th chapter of the outlaws of the marsh by Shi Naian of the Ming Dynasty, "all the troops felt the earth in the dark and could not distinguish between the East and the west, so they had to dismount and accept surrender."
Idiom usage
It's too dark to see anything. When Wang Xiaoer heard this, he got up in the dark and was very busy. He fished out his trousers and couldn't put them on either the left or the right. (journey to the west by Wu Chengen of Ming Dynasty, 84)
Chinese PinYin : hēi tiān mō dì
be so dark that nothing is discernible
It's hard to live up to the name. míng shí nán fù
plant trees for the benefit of posterity. qián rén zāi shù,hòu rén chéng liáng
The willows cry and the flowers cry. liǔ qì huā tí