paḳāru - to claim, to contest (CAD P 130, AHw. 104, 1547, EDA I 153)

Var. baḳāru. Derived words: paḳāru ‘claim’ (CAD P 129, AHw. 826); pāḳirānu, bāḳirānu, pāriḳānu, pāḳarānu, piḳirānu ‘claimant’ (CAD P 138, AHw. 105); pāḳiru, bāḳiru ‘claimant’ (CAD P 139; AHw. 827); paḳru, baḳru ‘claim’ (CAD P 140, AHw. 105); paḳru, baḳru ‘contested, disputed’ (CAD P 140); pirḳu (a metathesized form) ‘claim’ (CAD P 409; AHw 867); puḳurrānāˀu, buḳurrānāˀu ‘claim against a person or property’ (CAD P 515); puḳurrû (or buḳurrû) ‘claim’ (CAD P 515, AHw. 139); tapqirtu ‘legal claim, contention’ (CAD T 193, AHw. 1322).
No definitive etymology can be suggested. See EDA I 153 for the details.