7.4.85 नुगतोऽनुनासिकान्तस्य

Word by word (padaccheda)

Substitute / term नुक् prathamā · ekavacanaTarget अतः ṣaṣṭhī · ekavacanaTarget अनुनासिकान्तस्य ṣaṣṭhī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).

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Full reading

नुक् अतः अनुनासिकान्तस्य

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

Commentary

The augment नुक् (न्) is added after the short अ of a reduplicate in the Intensive (with expressed or elided यङ्) when the root ends in a nasal.
As तन्तन्यते and तन्तनीति; जङ्गम्यते and जङ्गमीति, यंयम्यते and यंयमीति; रंरम्यते and रंरमीति ॥ The augment न् here should be considered as anusvara, because an adesa is indicated by the nature of the sthanin which is replaced; and therefore in यंयम्यते, it remains anusvara. Had it been म्, it could not have been changed to anusvara in यंयम्यते, रंरम्यते (See 8.3.24). In तन्तन्यते &c, the anusvara is changed to न्, ङ् &c, by 8.4.58; the other forms तन्तन्यते तंतनीति, जंगम्यते, जंगमीति are derived by the following :-

Vart:- This anusvara should be treated as if it was at the end of a Pada or word. That being so, 8.4.59 applies, and we have the anusvara unchanged, as in तंतन्यते &c.

Why do we say "after a short अ"? Observe तेतिम्यते ॥ The त् in अत् indicates that the augment will not be added to a reduplicate which once was long आ but became short by 7.4.59 as from भाम 'to be angry', is बाभाम्यते, (the second lengthening takes place by 7.4.83). Why do we say ending in a nasal? Observe पापच्यते ॥

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