وَإِن يَكَادُ ٱلَّذِينَ كَفَرُواْ لَيُزۡلِقُونَكَ بِأَبۡصَٰرِهِمۡ لَمَّا سَمِعُواْ ٱلذِّكۡرَ وَيَقُولُونَ إِنَّهُۥ لَمَجۡنُونٞ ٥١
And indeed, those who disbelieve would almost make you slip with their eyes [i.e., looks] when they hear the message, and they say, "Indeed, he is mad."
Translation: Saheeh International (English)
Each word's meaning and sound
And indeed, those who disbelieve in Allah and reject his Messengers could almost bring you to the ground with their eyes due to their extremely sharp glances towards you when they hear this Qur’ān that was revealed to you. While following their desires and turning away from the truth, they say, “Indeed, the Messenger who has brought it is a madman.”
Al-Mukhtasar in interpreting the Noble Quran