ا ص رʾ-ṣ-r
(ض) اَصَرَ يَاْصِرُ اَصْرًاaṣara yāṣiru aṣran: to tie a knot in something.
اِصْرٌiṣr (noun, ism dhāt): (1) covenant, pledge. ﴿وَاَخَذْتُمْ عَلٰى ذٰلِكُمْ اِصْرِيْ﴾ (Āl ʿImrān 3:81)(2) responsibility, burden. ﴿وَلَا تَحْمِلْ عَلَيْنَآ اِصْرًا﴾ (Al-Baqarah 2:286)