be so dark that nothing is discernible

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)