Valmiki Ramayana Aranya Kanda Sarga 51 Shloka 12
Original Shlokaततोऽन्यद्धनुरादाय रावणः क्रोधमूर्छितः। ववर्ष शरवर्षाणि शतशोऽथ सहस्रशः।।3.51.12।।
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ततः then, रावणः Ravana, क्रोधमूर्छितः overcome with anger, अन्यत् other, धनुः bow, आदाय after taking, शतशः hundreds of, अथ and, सहस्रशः in thousands, शरवर्षाणि rain of arrows, ववर्ष rained.
Overcome with anger, Ravana took another bow and rained (on him) hundreds and thousands of arrows.