Valmiki Ramayana Yuddha Kanda Sarga 91 Shloka 52
Original Shlokaतौभासयन्तावाकाशंधनुर्भ्यांविशिखौच्युतौ ।।6.91.52।। मुखेनमुखमाहत्यसन्निपेततुरोजसा ।
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धनुर्ब्याम् from the bows, च्युतौ released, तौ those, विशिखौ arrows, आकाशम् sky, भासयन्तौ lighting, मुखेन heads collided, मुखम् hitting the head, आहत्य meeting, ओजसा glowing, सन्निपेततुः rubbed against each other
Those arrows released from the bows lit the sky when their heads collided with each other and glowed by rubbing against each other.