Killing the Rakshashi-Yakshini

Sri Vishwamitra uttered this benediction when Sri Rama was about to kill the Yakshini Taraka-

राघवयो: स्वस्ति अस्तु जयं चैव 

विश्वामित्रस्तु ब्रह्मर्षिर्हुङ्कारेणाभिभर्त्स्यताम्।
स्वस्ति राघवयोरस्तु जयं चैवाभ्यभाषत।।1.26.14।।

ब्रह्मर्षि: Brahmarshi, विश्वामित्रस्तु Visvamitra, ताम् her, हुङ्कारेण with a Hunkara (menacing sound), अभिभर्त्स्य threatened, राघवयो: for Rama and Lakshmana, स्वस्ति अस्तु May there be aupicousness, जयंचैव victory also, अभ्यभाषत spoke.

Brahmarshi Visvamitra threatened her with Hunkara (menacing sound) and spoke saying "May the two Raghavas (Rama and Lakshmana) be aupicousness and victorious". 

तामापतन्तीं वेगेन विक्रान्तामशनीमिव।।1.26.25।।
शरेणोरसि विव्याथ सा पपात ममार च।

विक्रान्ताम् advancing powerully, अशनीमिव like to a thunderbolt, वेगेन with speed, आपतन्तीम् approaching, ताम् her, शरेण with arrow, उरसि in the chest, विव्याथ pierced, सा पपात she fell down, ममार च also died.

Rama pierced with an arrow in the chest of Tataka who was exhibiting prowess and approaching him with speed like that of a thunderbolt. She fell down and died.