م و رm-w-r
(ن) مَارَ يَمُوْرُ مَوْرًاmāra yamūru mawran (original form: مَوَرَmawara): to move to and fro, to sway, to spin rapidly.
مَوْرmawr: agitation, quaking. Three times in the Quran, mostly in describing the sky on the Day of Resurrection: ﴿يَوْمَ تَمُوْرُ السَّمَاءُ مَوْرًا﴾ (Aṭ-Ṭūr 52:9) and ﴿أَنْ يَّخْسِفَ بِكُمُ الْأَرْضَ فَإِذَا هِيَ تَمُوْرُ﴾ (Al-Mulk 67:16).