Surah Taha Tafseer

فَأَتْبَعَهُمْ فِرْعَوْنُ بِجُنُودِهِ فَغَشِيَهُم مِّنَ الْيَمِّ

Then Fir`awn pursued them with his hosts, but the sea (Al-Yamm) completely overwhelmed them,

Al-Yamm means the sea.

مَا غَشِيَهُمْ

and covered them up.

meaning, covered them up with a thing that was well-familiar to them in such a situation, as Allah states;

وَالْمُوْتَفِكَةَ أَهْوَى

فَغَشَّـهَا مَا غَشَّى

And He destroyed the overthrown cities. So there covered them that which did cover. (53:53-54)

وَأَضَلَّ فِرْعَوْنُ قَوْمَهُ وَمَا هَدَى