Quran english At Tur 44

وإن يروا كسفا من السماء ساقطا يقولوا سحاب مركوم

Wa-in yaraw kisfan mina assama-isaqitan yaqooloo sahabun markoom

 
Sahih International
And if they were to see a fragment from the sky falling, they would say, “[It is merely] clouds heaped up.”
Muhsin Khan
And if they were to see a piece of the heaven falling down, they would say: “Clouds gathered in heaps!”
Pickthall
And if they were to see a fragment of the heaven falling, they would say: A heap of clouds.
Yusuf Ali
Were they to see a piece of the sky falling (on them), they would (only) say: “Clouds gathered in heaps!”
Shakir
And if they should see a portion of the heaven coming down, they would say: Piled up clouds.
Dr. Ghali
And in case they saw a dark lump falling down from the heaven, they would say, “Accumulated clouds!”