Valmiki Ramayana Ayodhya Kanda Sarga 118 Shloka 49

पूरयता while stringing, तेन by Rama, वेगात् with force, धनुः bow, मध्ये in the middle, द्विधा into two, भग्नम् was broken, तस्य its, भीमः dreadful, शब्दः sound, पतितस्य fallen, अशनेरिव like that of a thunder, अभवत् arose.

When Rama was stringing the bow with force, it was broken into two in the middle and fell down with a dreadful sound like that of thunder.