Valmiki Ramayana Sundara Kanda Sarga 48 Shloka 24
Original Shlokaआयान्तं सरथं दृष्ट्वा तूर्णमिन्द्रजितं कपिः। विननाद महानादं व्यवर्धत च वेगवान्।।5.48.24।।
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कपिः monkey, तूर्णम् speedily, आयान्तम् coming, सरथम् that chariot, इन्द्रजितम् Indrajit, दृष्टवा after seeing, महानादम् great sound, विननाद made, वेगवान् who was endowed with speed, व्यवर्धत च enlarged his body
Hanuman of very high speed enlarged his body and roared, perceiving Indrajit's chariot coming swiftly.