pērththanai māsagadam piḷḷaiyāy – Even when you were but a mere child, you obliterated a colossal wheel, which was immovable by mere mortal efforts, simply by your divine kick.
mā sagadam – an immense wheel. The āzhvār expresses trepidation concerning what adversities might befall Emperumān due to this wheel. This act of divine intervention by Emperumān occurred