5.3.72
कस्य च दः
Operational rule vidhi
The letter द is the substitute of the final क् of an indeclinable when the affix अकच् (अक्) is added.
Word by word (padaccheda)
Target कस्य ṣaṣṭhī · ekavacanaIndeclinable च avyayaSubstitute / term दः prathamā · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Dotted words are technical terms. Hover or tap one to see its card.
Full reading
कस्य च दः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
कस्य → दः
Replace kasya with daḥ. Inherited words (anuvṛtti) may add further conditions.
Commentary
The letter द is the substitute of the final क् of an indeclinable when the affix अकच् (अक्) is added.
The word अव्यय is to be read into this sutra and not सर्वनाम, because no Pronominal ends in क् ॥ Thus धकित्, हिरकुत् and पृथकत् from धिक्, हिरुक् and पृथक् ॥ Thus हिरुक् + अक् = हिर् + अक् + उक् = हिरकुत्, now comes the present rule and the final क् is changed into द्, as हिरकुद् or त् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.