गुपेश्छन्दसि

Operational rule vidhi

After the verb गुप् 'to protect', चङ् is optionally the substitute of च्लि in the छन्दस् (Vedas).

Word by word (padaccheda)

Left context गुपेः pañcamī · ekavacanaRight context छन्दसि 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

गुपेः छन्दसि

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

Commentary

After the verb गुप् 'to protect', चङ् is optionally the substitute of च्लि in the छन्दस् (Vedas).
This rule applies where the root गुप् does not take the affix आय 2.1.28. As इमान् नो मित्रावरुणौ यत् गृहान् अजुगुपतम् 'Mitra Varuna protected these our houses'. The other forms are अगौप्तम्, अगोपिष्टम् or आगोपायिष्टम्. In the secular literature, the latter three forms are used, but not the first.

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