• atithīn — guests
  Accusative plural. The triad insist on the atithi status to bind Jarāsandha's hand. Atithi-dharma is unbreakable for a brahmaṇya king.
• arthinaḥ — desirous of gain
  Nominative plural. They identify as petitioners — which obliges the king to ask what is wanted. The trap is set with this single word.
• prayaccha — please grant
  Imperative. The petition is open-ended; the king has not yet asked what is wanted. The verse's tension lies entirely in that gap.
• kāmayāmahe — we are desiring
  Present middle plural — 'we for ourselves desire'. The verb form is mild, almost shy; the desire it cloaks is dvanda-yuddha to the death.

• Where do I dress up my needs in such complicated language that they cannot be heard?
• What would simple, direct asking sound like?

Three visitors at a door, asking only that whatever they wish be granted — this is the Vedic version of a sealed envelope. Once Jarāsandha said 'come in,' he had to sign whatever was inside. Kṛṣṇa speaks the most innocent words in the chapter; the words contain a death.