ب س مb-s-m
(ض) بَسَمَ يَبْسِمُ بَسْمًاbasama yabsimu basman: to smile.
Form V (tafaʿʿul) تَبَسَّمَ يَتَبَسَّمُ تَبَسُّمًاtabassama yatabassamu tabassuman: to smile with effort, to break into a smile. ﴿فَتَبَسَّمَ ضَاحِكًا مِّنْ قَوْلِهَا﴾ (An-Naml 27:19)