क्वाति

Operational rule vidhi

The word किम् is converted to क्व when followed by the विभक्तिप्रत्यय 'अत्'.

Word by word (padaccheda)

Word क्व Right context अति saptamī · ekavacana

Word Case not marked in the source data.
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

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Full reading

क्व अति

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

कु is substituted for किम् before the विभक्ति अत् ।
As क्व गमिष्यसि, क्व भोक्ष्यते ॥ The substitute कु of the last rule, before the affix अ would have become क्व, but that it would have caused guna, hence this separate substitute. Had the sutra been किमोऽड्वत् it would not have included the अकच् augmented किम् ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.