We let loose against them a violent roaring wind on a day of ill omen, continuous,
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (lo! we let loose on them a raging wind) a cold wind, which is the west wind (on a day of constant calamity) a day of continuous calamity upon the young and the old,
Jalāl al-Dīn al-Maḥallī
تفسير : indeed we unleashed upon them a clamorous wind, intensely noisy, on a day of prolonged ill fortune, (nahsin mustamirr means) either one of continuous ill fortune, or one of severe ill fortune — and this was the last wednesday of the month —