6.1.7
तुजादीनां दीर्घोऽभ्यासस्य
Operational rule vidhi
In the room of a short vowel of the Reduplicate of the the roots तुज् etc., a long is substituted.
Word by word (padaccheda)
Target तुजादीनाम् ṣaṣṭhī · bahuvacanaSubstitute / term prathamā · ekavacanaTarget ṣaṣṭhī · 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.
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Full reading
तुजादीनाम्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
तुजादीनाम् →
Replace tujādīnām abhyāsasya with dīrghaḥ. Inherited words (anuvṛtti) may add further conditions.
Commentary
In the room of a short vowel of the Reduplicate of the the roots तुज् etc., a long is substituted.
There is no list of तुजादि verbs given any where. The word आदि in तुजादि therefore should be construed as "verbs like tuj". So that wherever we may find a word having a long vowel in the Reduplicate, we should consider it a valid form. Thus तूतुजानः (तुज् + कानच् 3.2.106 = तूतुजानः Rig. I.3.6). मामहानः, अनड्वान् दाधार, स्वधां मीमाय, स तूताव ॥ This lengthening only takes place in the Vedas before some special affixes, and not every where or in secular literature. As तुतोज शबलान् हरीन् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.