Derived words: mupašširu (a profession) (CAD M₂ 210); napšartu (treated grain) (CAD N₁ 316, AHw. 741); napšurtu ‘release’ (CAD N₁ 318, AHw. 741); napšuru ‘forgiveness’ (CAD N₁ 319, AHw. 741); pašartu ‘sale(?)’ (CAD P 236); pašertu ‘undoing’ (CAD P 251); pašīratti ‘secretly’ (CAD P 252, AHw. 844); pāširtu ‘loosener’ (CAD P 252, AHw. 844); pašīru ‘secret’ (CAD P 252, AHw. 844); pāširu ‘dissolver’ (CAD P 252, AHw. 844); pāširu ‘exorcist, dream interpreter; peddler’ (CAD P 253, AHw. 844); pašru ‘loosened, calm, apportioned’ (CAD P 258, AHw. 845); pišīriš ‘secretly’ (CAD P 428, AHw. 868); piširtu ‘release’ (CAD P 428, AHw. 868); pišru ‘interpretation’ (CAD P 429, AHw. 868); puššurtu ‘solution(?)’ (CAD P 545, AHw. 884); tapšīrtu ‘absolution’ (CAD T 194, AHw. 1322); tapšuru ‘ransom’ (CAD T 195, AHw. 1323).
No definitive etymology can be suggested.