PS

*dhm - to be dark (Fronzaroli 1965a: 138–139, 145, 149; Kogan 2011: 196)

Akkadian
daˀāmu - to be(come) dark, dim (CAD D 1, AHw. 146)
Akkadian
daˀmu - dark (CAD D 74, AHw. 158)
Arabic
ˀadham - dark (Lane 925)