فَمَا ٱسۡطَٰعُوٓاْ أَن يَظۡهَرُوهُ وَمَا ٱسۡتَطَٰعُواْ لَهُۥ نَقۡبٗا ٩٧
So they [i.e., Gog and Magog] were unable to pass over it, nor were they able [to effect] in it any penetration.
Translation: Saheeh International (English)
فَمَا ٱسۡطَٰعُوٓاْ أَن يَظۡهَرُوهُ وَمَا ٱسۡتَطَٰعُواْ لَهُۥ نَقۡبٗا ٩٧
So they [i.e., Gog and Magog] were unable to pass over it, nor were they able [to effect] in it any penetration.
Translation: Saheeh International (English)
Each word's meaning and sound
So Gog and Magog were unable to climb over it due to its height nor were they able to make a hole in it from beneath due to its hardness.
Al-Mukhtasar in interpreting the Noble Quran