Valmiki Ramayana Sundara Kanda Sarga 57 Shloka 27
Original Shlokaगिरिगह्वरसंलीनो यथा गर्जति मारुतः।।5.57.27।। एवं जगर्ज बलवान् हनुमान्मारुतात्मजः।
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गिरिगह्वरसंलीनः like the wind in the mountain caves, मारुतः wind, यथा similarly, गर्जति roared, बलवान् powerful, मारुतात्मजः son of the Windgod, हनुमान् Hanuman, एवम् in that way, जगर्ज roared.
Hanuman, the powerful son of the Windgod roared like the wind captured in a mountain cave would.