Valmiki Ramayana Sundara Kanda Sarga 18 Shloka 31

तथा such, उग्रतेजाः possessed of extraordinary energy, सः he, हनुमान् Hanuman, तस्य his, तेजसा by the might, निर्धूतः taken aback, पत्रगुह्यान्तरे deep in the leaves, सक्तः concealed, संवृतः covered, अभवत् remained there.

Hanuman, possessed of extraordinary energy, was taken aback at the might of Ravana. He remained hiding covered over with leaves.