يَوْمَ تَمُورُ السَّمَاءُ مَوْرًا (...the Day when the sky will tremble, a horrible trembling, ...At-Tur 52:9 ⧉) The lexicographical denotation of the word mawr is violent shaking, or movement caused by unrest. This verse At-Tur 52:9 ⧉ describes the violent movement of the heavens on the Day of Resurrection.