नहिवृतिवृषिव्यधिरुचिसहितनिषु क्वौ

Operational rule vidhi

A long vowel is substituted for the final vowel of the preceding word, before the verbs 1. नह् 2. वृत् 3. वृष् 4. व्यध् 5. रुच् 6. सह् and 7. तन् when these roots take the affix क्वि.

Word by word (padaccheda)

Right context नहि- वृति- वृषि- व्यधि- रुचि- सहि- तनिषु saptamī · bahuvacanaRight context क्वौ saptamī · ekavacana

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

नहि-वृति-वृषि-व्यधि-रुचि-सहि-तनिषु क्वौ

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

Commentary

A long vowel is substituted for the final vowel of the preceding word, before the verbs 1. नह् 2. वृत् 3. वृष् 4. व्यध् 5. रुच् 6. सह् and 7. तन् when these roots take the affix क्वि।
Thus उपानह् (उपानत् Nominative Singular), so also, परीणत्, नीवृत्, उपावृत्, (with vrt) प्रावृट्, उपावृट्, (with vrsh) ममावित्, हृदयावित्, श्वावित् (with vyadh) नीरुक्, अभीरुक्, (with ruch) ऋताषट्, (with sah) तरीतट् (with tan). The nasal is elided after गम् before क्वि 6.4.40, by an extension of that rule, it is elided after तम् also. Why do we say when क्वि follows? Observe परिणहनम् ॥

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