تفسير : (and when the earth is spread out) like the spreading out of a flat plain; and it is also said this means: when the earth is removed from its place and then flattened.
Jalāl al-Dīn al-Maḥallī
تفسير : and when the earth is stretched out, [when] its width is increased, just as a piece of leather is stretched, so that no edifice or mountain remains upon it,