7.4.7
उर्ऋत्
Operational rule vidhi
Short ऋ is optionally substituted for the penultimate ऋ and ॠ of a Causative अङ्ग (stem) in the reduplicated Aorist.
Word by word (padaccheda)
Target उः ṣaṣṭhī · ekavacanaSubstitute / term ऋत् prathamā · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- 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
उः ऋत्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
उः → ऋत्
Replace uḥ with ṛt. Inherited words (anuvṛtti) may add further conditions.
Commentary
Short ऋ is optionally substituted for the penultimate ऋ and ॠ of a Causative अङ्ग (stem) in the reduplicated Aorist.
This debars the इर् 7.3.101, अर् 7.3.86, and आर् 7.2.114 substitutes. Thus अचिकीर्तत् 7.1.101 or अचिकिर्तत् from कॄत् (Churadi III) : अववर्तत् 7.3.86, or अवीवृतत्; अममार्जत् 7.2.114 or अमीमृजत् ॥ Though the इर्, अर् and आर् substitutes are antaranga operations, they are prohibited by the express text of this sutra. The short ऋ is substituted even for a long ॠ : the त् of ऋत् shows that, as in अचीकृतत् 8.2.77. In fact, this ऋ substitute does not take place after the operations of इर्, अर् and आर् substitutions have taken effect, but it is a form which suspends the operation of all those rules.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.