ش ف وsh-f-w
(ن) شَفَا يَشْفُوْ شَفْوًاshafā yashfū shafwan: (of the moon) to appear; (of a thing) to show its edge.
شَفَاshafā (noun, ism dhāt): the edge of anything. ﴿وَكُنْتُمْ عَلٰى شَفَا حُفْرَةٍ مِّنَ النَّارِ﴾ (Āl ʿImrān 3:103); ﴿عَلٰى شَفَا جُرُفٍ هَارٍ﴾ (At-Tawbah 9:109)(For شَفَتَيْنِshafatayni see sh-f-h.)