7.3.89 उतो वृद्धिर्लुकि हलि

Word by word (padaccheda)

Target उतः ṣaṣṭhī · ekavacanaSubstitute / term prathamā · ekavacanaRight context saptamī · 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").

Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.

Full reading

उतः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

A root ending in short उ , which has no Present characteristic (i.e. the विकरण is dropped by लुक् elision) gets वृद्धि before a पित् सार्वधातुक affix beginning with a consonant, but not if the अङ्ग (stem) is reduplicated.
Thus यौति, यौषि, यौमि; नौति, नौषि, नौमि, स्तौति, स्तौषि, स्तौमि ॥ Why ending in उ ? Observe एति, एषि, एमि ॥ Why do we say whose vikarana is elided by लुक्? Observe सुनोति, सुनोषि, सुनोमि ॥ Why beginning with हल् ? Observe यवाणि, रवाणि, the First Person of the Imperative is पित् by 3.4.92. Why before a पित् affix? Observe युतः, रुतः ॥ The augment यासुट् being ङित् 3.4.103, prevents पित् action in अपि स्तुयात् राजानम् ॥ The phrase नाभ्यस्तस्य should be read into the sutra from 7.3.87: therefore Vriddhi does not take place here योयोति तोनोति ॥ Here there is luk-elision of यङ् ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.