6.4.124
वा जॄभ्रमुत्रसाम्
Operational rule vidhi
ए is optionally substituted for अ of the अङ्ग (stems) 1. जर् (जॄ) 2. भ्रम and 3. त्रस् and the reduplicate is thereby elided before the affixes of the लिट् (Perfect Tense) having an indicatory क् (or ङ्)
Word by word (padaccheda)
Indeclinable वा avyayaTarget जॄ- भ्रमु- त्रसाम् ṣaṣṭhī · bahuvacana
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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Full reading
वा जॄ-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
ए is optionally substituted for अ of the अङ्ग (stems) 1. जर् (जॄ) 2. भ्रम and 3. त्रस् and the reduplicate is thereby elided before the affixes of the लिट् (Perfect Tense) having an indicatory क् (or ङ्)
Thus जेरतुः, जेरुः, जेरिथ, or जजरतुः, अजरुः, जजरिथ, भ्रेमतुः, भ्रेमुः, भ्रेमिथ, or बभ्रमतुः, बभ्रमुः, बभ्रमिथ, त्रेसतुः, त्रेसुः, त्रेसिथ, or तत्रसतुः, तत्रसुः, तत्रसिथ ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.