To impede one's own prospect of reincarnation in auspicious Gati (2) (realm of mundane existence) through indulging in evil conduct.
gateḥ- devagatyādeḥ prakaraṇācchubhāyāḥ pratighātaḥ- tatprāptiyogyatve sati vikarmmakaraṇādaprāptirgatipratighātaḥ.
(Sthā 5.70 Vṛ Pa 289)