महातेजाः highly energetic, सःत्रिशिराः that Trisira, तेन by that, तलाभिहतः hit by palm, स्रस्तहस्तायुधः weapon dropped from hand, त्यक्तचेतनः senses lost, भुवि ground, निपपात fell.

Trisira, a highly energetic one, hit by Hanuman with his palm, dropped the weapon from his hand, lost his senses and fell on the ground.