6.4.61
वाक्रोशदैन्ययोः
Operational rule vidhi
The long is optionally substituted for the इ in क्षि before the Past Participle in क्त when it is not in the sense of the future Passive Participle in ण्यत् when the word means 'imprecation' or 'a miserable plight'.
Word by word (padaccheda)
Indeclinable वा avyayaRight context आक्रोश- दैन्ययोः saptamī · dvivacana
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
- 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
वा आक्रोश-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The long is optionally substituted for the इ in क्षि before the Past Participle in क्त when it is not in the sense of the future Passive Participle in ण्यत् when the word means 'imprecation' or 'a miserable plight'.
Thus क्षितायुरेधि or क्षीणायुरेधि, क्षितकः or क्षीणकः, क्षितोयं तपस्वी, क्षीणोऽयं तपस्वी ॥ When not having the sense of cursing or miserable condition, we have one form only, as क्षीणश्चन्द्रः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.