3.1.79
तनादिकृञ्भ्य उः
Operational rule vidhi
A verb belonging to the तनादिगण gets the विकरणप्रत्यय 'उ' in presence of a सार्वधातुक प्रत्यय in कर्तरि प्रयोग.
Word by word (padaccheda)
Left context तनादि- कृञ्- भ्यः pañcamī · bahuvacanaSubstitute / term उः prathamā · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- 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
तनादि-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix उ comes after the roots of the तनादिगणः (8th Conjugation) and after the verb कृ 'to make', when a सार्वधातुक affix follows, signifying the agent.
This debars शप्. As तन् + उ + ति = तनोति 'he expands'; कृ + उ + ति = करोति 'he makes'. Though the root कृ is included in the list of the Tanadiverbs, for which see Dhatupatha, yet its separate enunciation in the present sutra is for the sake of making a restrictive rule with regard to this verb; that is to say, the root कृ is a Tanadiroot only for the purposes of taking the affix उ; all the other operations of Tanadiverbs are not to be performed upon it. Thus the rule (II.4.79.) does not apply to कृ. Thus अकृत and अकृत्याः; the सिच् elision being compulsory and not optional.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.