To indulge in the Pratiṣevaṇā (indulging in transgression like prāṇātipāta (injuring or killing a living being etc.)) out of sheer arrogance or instigation due to attachment or due to aversion.
dappo puṇa vaggāṇāīo iti vacanāt. tasmādāgamapratiṣiddhaprāṇātipātādyāsevāyā sā darppapratiṣevaṇā.
(Sthā 10.69 Vṛ Pa 460)
rāgadveṣābhyām anugatāsahitāyā pratisevanā sā darpikā.
(BṛBhā 4943 Vṛ)