6.4.110
अत उत् सार्वधातुके
Operational rule vidhi
If an अङ्ग of verb root कृ ends in an उकारान्त प्रत्यय, then the अकार of that अङ्ग is converted to उकार when followed by a कित् / ङित् प्रत्यय.
Word by word (padaccheda)
Target अतः ṣaṣṭhī · ekavacanaSubstitute / term उत् prathamā · ekavacanaRight context saptamī · 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.
- 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
अतः उत्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
अतः → उत् /
Replace ataḥ with ut when sārvadhātuke follows. Inherited words (anuvṛtti) may add further conditions.
Commentary
Before a सार्वधातुक affix with an indicatory क् or ङ् , short उ is substituted for the अ if कृ 'to make' (कर् + उ) when गुण-ated.
Thus कृ + उ + तस् = कर् + उ + तस् 7.3.84 = कुर् + उ + तस् = कुरुतः 6.4.110 The तस् is ङित् by 1.2.4. So also कुर्वन्ति, कुरु ॥ Why do we say 'before a Sarvadhatuka'? So that the rule may apply to what was once a Sarvadhatuka, though no longer existent. Thus कुरु where the personal ending हि is elided, but it leaves its effect behind. The त् in उत् shows that this उ is not to be gunated by 7.3.86. When the affix is not कित् or ङित् we have करोति, करोषि and करोमि 1.2.4.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.