Nirjarā is the falling away of accumulated karma. Some karma ripens and drops away of itself; the aspirant hastens the process through tapas, outer austerities such as fasting and inner ones such as repentance, service, study and meditation. When all karma is shed, the soul shines in its own nature.
Nirjarā
The shedding of karma already bound to the soul, chiefly through austerity and meditation.
Also: Nirjara