Below is word by word meaning of this Dua/Remembrance said at a sitting or gathering with links to the root words of Quran, grammar and their dictionary meaning to help you learn Quran Vocabulary.

سُبْحَانَكَ اللَّهُمَّ وَبِحَمْدِكَ أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ أَنْتَ أَسْتَغْفِرُكَ وَأَتُوبُ إِلَيْكَ 

[Sunan Abi Dawud 4859]

When the Messenger of Allah (ﷺ) intended to get up from the assembly he used to say in the last. Glory be to Thee. O Allah, and I begin with praise of Thee, I testify that there is no god but Thou; I ask Thy pardon, and return to Thee in repentance. The man asked: Messenger of Allah! you utter the words now which you did not do in the past? He replied: (This is an) atonement for what takes place in the assembly.

Word by Word meaning of Remembrance said at a sitting or gathering

سُبْحَانَكَ Glory be to You اللَّهُمَّ O Allah وَ and بِحَمْدِكَ with Your praise أَشْهَدُ I witness أَنْ that لاَ إِلَهَ there is no god إِلاَّ except أَنْتَ You أَسْتَغْفِرُكَ I seek Your forgiveness وَ and أَتُوبُ I turn إِلَيْكَ towards You