नेरनिधाने

Operational rule vidhi

After नि the second member has the acute accent (उदात्त) on the last syllable when the sense is of 'not laying down'.

Word by word (padaccheda)

Left context नेः pañcamī · ekavacanaRight context अनिधाने saptamī · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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

नेः अनिधाने

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

Commentary

After नि the second member has the acute accent (उदात्त) on the last syllable when the sense is of 'not laying down'.
The word निधानं = अप्रकाशता 'not making manifest'. Thus निमूल꣡म्, न्यक्ष꣡म्, नितृण꣡म् ॥ These are either Bahuvrihi or pradisamasa. In the case of their being Avyayibhava, they would have acute on the final by 6.1.223. Why do we say when meaning 'not laying down'? Observe निवाक् = निहितवाक् as निवाग्वृषलः; निदण्डः = निहितदण्डः ॥ The force of नि is that of निधान here.

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