A type of Prāyaścitta (expiation);
the expiation for indulging in concealment of one's blemish deceitfully.
parikuñcanam-aparādhasya dravyakṣetrakālabhāvānāṃ gopāyanamanyathā satāmanyathā bhaṇanaṃ parikuñcanā parivancanā vā....tasyāḥ prāyaścitaṃ parikuñcanāprāyaścitaṃ.
(Sthā 4.133 Vṛ Pa 189)