मीनातेर्निगमे

Operational rule vidhi

In the छन्दस् (Vedas) मी is shortened before a शित् affix.

Word by word (padaccheda)

Target मीनातेः ṣaṣṭhī · ekavacanaRight context निगमे saptamī · ekavacana

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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

मीनातेः निगमे

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

Commentary

In the छन्दस् (Vedas) मी is shortened before a शित् affix.
As प्रमिनन्ति व्रतानि Rig. X. I0.5. The न becomes ण (प्रमिणन्ति according to Kasika) by 8.4.1. Why in the Veda Observe प्र मीणाति ॥

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