"It envelopes the people." The interpretation of Mujahid is: it means drought and the withholding of rain from [the disbelievers of Quraysh].
﴿يغشى النَّاس﴾ تَفْسِير مُجَاهِد: يَعْنِي: الجدب وإمساك الْمَطَر عَن [كفار قُرَيْش].