۞ وَتَرَكْنَا بَعْضَهُمْ يَوْمَئِذٍ يَمُوجُ فِى بَعْضٍ ۖ وَنُفِخَ فِى ٱلصُّورِ فَجَمَعْنَـٰهُمْ جَمْعًا

EnglishSaheeh International: And We will leave them that day surging over each other, and [then] the Horn will be blown, and We will assemble them in [one] assembly.
TamilJan Trust Foundation: இன்னும், அந்நாளில் அவர்களில் சிலரைச் சிலருடன் (கடல்) அலைகள் (மோதுவதைப் போல்) மோதுமாறு நாம் விட்டு விடுவோம்; பின்னர், ஸூர் (எக்காளம்) ஊதப்படும்; பிறகு நாம் அவர்களை ஒன்று சேர்ப்போம்.
SinhalaRuwwad Center: එදින ඔවුන්ගෙන් ඇතැමෙකු ඇතැමෙකු තුළ රළ මෙන් නගින්නට අපි අත හැර දමන්නෙමු. තවද හොරණෑවෙහි පිඹිනු ලැබේ. එවිට අපි ඔවුන් සියල්ල එක් රැස් කරන්නෙමු.
UrduMaulana Muhammad Junagarhi: اس دن ہم انہیں آپس میں ایک دوسرے میں گڈ مڈ ہوتے ہوئے چھوڑ دیں گے اور صور پھونک دیا جائے گا پس سب کو اکٹھا کرکے ہم جمع کر لیں گے.
JapaneseRyoichi Mita: その日われは，人を御互いに押し寄せる波のようにまかせよう。その時ラッパが吹かれ，それでわれは凡ての者を一斉に集める。
ChineseMa Jian: 那日，我将使他们秩序紊乱。号角一响，我就把他们完全集合起来。

Tafsir of 18:99

The Barrier restrains Them, but It will be breached when the Hour draws nigh Allah tells us that Ya'juj and Ma'juj could not climb over the barrier or penetrate its lower portion. Varying forms of the verb are used here in the Arabic text to reflect the difficulty of the action referred to. فَمَا اسْطَعُواْ أَن يَظْهَرُوهُ وَمَا اسْتَطَعُواْ لَهُ نَقْبًا (So they (Ya'juj and Ma'juj) could not scale it or dig through it.) This indicates that they could not penetrate it or dig through it. Imam Ahmad recorded that Zaynab bint Jahsh, the wife of the Prophet said, "The Prophet woke from sleep, and he was red in the face. He said, «لَا إِلَهَ إِلَّا اللهُ وَيْلٌ لِلْعَرَبِ مِنْ شَرَ قَدِ اقْتَرَبَ فُتِحَ الْيَوْمَ مِنْ رَدْمِ يَأْجُوجَ وَمَأْجُوجَ مِثْلُ هَذَا» (La ilaha illallah! Woe to the Arabs from the evil that has approached (them). Today a hole has been opened in the barrier of Ya'juj and Ma'juj like this.) and he made a circle with his index finger and thumb.…

Source: Ibn Kathir (Abridged)