Valmiki Ramayana Sundara Kanda Sarga 46 Shloka 24
Original Shlokaअर्ध्यमानस्ततस्तेन दुर्धरेणानिलात्मजः।।5.46.24।। चकार कदनं भूयो व्यवर्धत च वेगवान्।
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तेन by him, दुर्धरेण by Durdhara, अर्ध्यमानः attacked, अनिलात्मजः son of the Windgod, ततः then, कदनम् battle, चकार fought, वेगवान् swift hero, भूयः again, व्यवर्धत grew in size.
When the son of the Windgod was attacked by Durdhara, he again grew in size