तेन by that, मुष्टिप्रहारेण blow of the fist, राक्षसेश्वरः Rakshasa Lord, रावणः Ravana, चचाल shaken, जानुभ्याम् on his knees, भूमौ on the ground, अपतत् च fell.

By the blow of Hanuman's fist, Ravana the Lord of Rakshasas was shaken and fell on the ground on his knees.