Valmiki Ramayana Yuddha Kanda Sarga 76 Shloka 89

तत्र there, तेन by that, अभिहतः hit, महाबलः mighty, वानरर्षभः bull of Vanaras, सः he, सुग्रीवः Sugriva, वज्रकल्पम् adamant, मुष्टिम् fist, सम्वर्तयामास clenched.

Then mighty Sugriva, the bull among Vanaras, hit by the fist, clenched his fist adamantly.