'Dark' in the Bible

And they covered the surface of all the land, and the land was dark [with them], and they ate all the vegetation of the land and all the fruit of the trees that the hail had left, and no green was left in the trees nor in the vegetation of the field in all the land of Egypt.

[so that] it came between the camp of Egypt and the camp of Israel. And {it was a dark cloud}, but it gave light [to] the night, [so that] {neither approached the other} all night.