Which weighed down your back.Al-Inqad means the sound.And more than one of the Salaf has said concerning Allah's saying, الَّذِى أَنقَضَ ظَهْرَكَ meaning,`its burden weighed heavy upon you.'Then All�h says, وَرَفَعْنَا لَكَ ذِكْرَكَ