A type of fault (or fallacy) in Vāda (polemics); on failing to prove one's own view, to put down the disputant in argument through the practice of deception or trick, either by Vādī (speaking in favour of a proposition) or Prativādī (the opposition).
svapakṣāsiddhirūpaḥ parājayo nigrahahetntvānnigrahaḥ.
(Pramī; 2.1.33)
nigrahaḥ - chalādināparājayasthānaṃ sa eva doṣo nigrahadoṣaḥ.
(Sthā 10.44 Vṛ Pa 468)