Inherited from Prakrit 𑀲𑀟𑀇 (saḍaï). Compare Hindi सड़ना (saṛnā) / Urdu سڑنا (saṛnā) or Sindhi سَڙَڻُ (saṛaṇu).
سَڑنَا • (saṛnā) (intransitive, Gurmukhi spelling ਸੜਨਾ)