(ن، ض) حَلَّ يَحُلُّḥalla yaḥullu / يَحِلُّ حَلًّا وَحِلًّا وَحَلَالًاyaḥillu ḥallan wa-ḥillan wa-ḥalālan: the basic meaning is to untie a rope; with this basic sense it occurs in various meanings:(ن) حَلَّ يَحُلُّḥalla yaḥullu: (1) to untie a knot.
اُحْلُلْuḥlul (imperative, amr): untie. ﴿وَاحْلُلْ عُقْدَةً مِّنْ لِّسَانِيْ﴾ (Ṭā Hā 20:27); (2) to alight at a place (on reaching a halting-place one dismounts and unties the ropes of the baggage). ﴿اَوْ تَحُلُّ قَرِيْبًا مِّنْ دَارِهِمْ﴾ (Ar-Raʿd 13:31); (3) to come out of iḥrām (the restrictions, i.e. the bonds, of iḥrām are loosed). ﴿وَاِذَا حَلَلْتُمْ فَاصْطَادُوْا﴾ (Al-Māʾidah 5:2)
(ض) حَلَّ يَحِلُّḥalla yaḥillu: (1) to become due, to befall, with the preposition عَلٰىʿalā. ﴿فَيَحِلَّ عَلَيْكُمْ غَضَبِيْ﴾ (Ṭā Hā 20:81); (2) to be permissible, to be lawful (the restriction on use is loosed), with the preposition li-. ﴿لَا هُنَّ حِلٌّ لَّهُمْ وَلَا هُمْ يَحِلُّوْنَ لَهُنَّ﴾ (Al-Mumtaḥanah 60:10)
مَحِلٌّmaḥill (noun of time or place, ẓarf): place of alighting, destination. ﴿حَتّٰى يَبْلُغَ الْهَدْيُ مَحِلَّهُۥ﴾ (Al-Baqarah 2:196)
حِلٌّḥill (also an adjective): permissible, lawful; alighted, resident. ﴿وَاَنْتَ حِلٌّۢ بِهٰذَا الْبَلَدِ﴾ (Al-Balad 90:2)
حَلَالٌḥalāl (also an adjective): permissible, lawful. ﴿يٰٓاَيُّهَا النَّاسُ كُلُوْا مِمَّا فِي الْاَرْضِ حَلٰلًا طَيِّبًا﴾ (Al-Baqarah 2:168)
حَلِيْلٌḥalīl (on the pattern of فَعِيْلٌfaʿīl): husband (he is always lawful to the wife); حَلِيْلَةٌḥalīlah pl. حَلَائِلُḥalāʾilu: wife (she is always lawful to the husband). ﴿وَحَلَآئِلُ اَبْنَآئِكُمُ الَّذِيْنَ مِنْ اَصْلَابِكُمْ﴾ (An-Nisāʾ 4:23)
Form IV (ifʿāl) اَحَلَّ يُحِلُّ اِحْلَالًاaḥalla yuḥillu iḥlālan: to make something permissible, to make lawful. ﴿وَاَحَلَّ اللّٰهُ الْبَيْعَ﴾ (Al-Baqarah 2:275)
Form II (tafʿīl) حَلَّلَ يُحَلِّلُ تَحْلِيْلًا وَتَحِلَّةًḥallala yuḥallilu taḥlīlan wa-taḥillatan: to pay expiation (so as to loose the bond of a vow or an oath). ﴿قَدْ فَرَضَ اللّٰهُ لَكُمْ تَحِلَّةَ اَيْمَانِكُمْ﴾ (At-Taḥrīm 66:2)