√pf3 'be busy'
present: [5.] pfRoti pfRvARa verbal: pfta E.+ secondary: passive: priyate E.+ -- causative: pArayati etc. derivatives: -pra? -pAra E.+ Only with A and (especially) vyA; hence in all probability a specialized use of 1 or 2pf (1pf 'be filled up or occupied', or 2pf with vi-A, 'made to pass to and fro, kept in motion').