Knowledge-veiling Karma - One of the main eight (types of) Karmas;
the Karma, through which the soul's faculty of cognition of the specific attributes of the object is veiled.
jñāyate - paricchidyate vastvaneneti jnānaṃ - sāmānyaviśeṣātmake vastuni viśeṣagrahanāt- mako bodhaḥ, āvriyate - ācchādyate anenetyā- varaṇīyaṃ.......jñānasyāvaraṇīyaṃ jnānāvaraṇīyam.
(TaBhā 8.5 Vṛ)