ا ص لʾ-ṣ-l
(ک) اَصُلَ يَاْصُلُ اَصَالَةًaṣula yāṣulu aṣālatan: to have roots, to take root.
اَصْلٌaṣl pl. اُصُوْلٌuṣūl (noun, ism dhāt): root, foundation. ﴿اَصْلُهَا ثَابِتٌ وَّفَرْعُهَا فِي السَّمَآءِ﴾ (Ibrāhīm 14:24)
(س) اَصِلَ يَاْصَلُ اَصَلًاaṣila yāṣalu aṣalan: to change, to grow weak.
اَصِيْلٌaṣīl pl. اٰصَالٌaṣāl (adjective on the pattern of faʿīl): changing, weak; then, in this sense, the time between the afternoon and sunset, that is, evening. ﴿وَسَبِّحُوْهُ بُكْرَةً وَّاَصِيْلًا﴾ (Al-Aḥzāb 33:42); ﴿بِالْغُدُوِّ وَالْاٰصَالِ﴾ (Al-Aʿrāf 7:205)