with an unexplained loss of -b-
Perhaps cf. PS *grr ‘to pull, to drag’
Fem. nāgirtu.
Cf. Gez. nagara ‘to say’ and its Ethiopian cognates (Kogan 2015: 340: a non-attested *nagāru ‘to announce’, but nugguru ‘to denounce’ as well as in its nominal derivates munaggiru ‘informer’ (CAD M₂ 198) and taggirtu ‘denunciation’ (CAD T 38). Hard to separate from Sum. nimgir with the same meaning, and a borrowing from Akk. to Sum. appears more likely than vice versa (Edzard 1981:284‒285, Steiner 2003:634, Sassmannshausen 1995:91‒92, contra Sommerfeld 2006:64)