कश्च who is he, त्वाम् to you, प्रोत्साहयति he encourages, स च he, शत्रुः enemy, असंशयः no doubt, त्वया by you, अशीविषमुखात् from the serpent's mouth, दंष्ट्राम् fangs, उद्धर्तुम् to pluck out, इच्छति desires.

He who has encouraged you in this is your enemy, indeed. He wants you to pluck out the fangs from the serpent's mouth.