कृमृदृरुहिभ्यश्छन्दसि

Operational rule vidhi

After the words कृ 'to do', मृ 'to die', दॄ (9P) 'to tear' and रुह 'to rise', अङ् is the substitute of च्लि when used in छन्दस् (Vedas).

Word by word (padaccheda)

Left context कृ- मृ- दृ- रुहिभ्यः pañcamī · bahuvacanaRight 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

कृ-मृ-दृ-रुहिभ्यः 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 words कृ 'to do', मृ 'to die', दॄ (9P) 'to tear' and रुह 'to rise', अङ् is the substitute of च्लि when used in छन्दस् (Vedas).
Thus अकरत् 'he did'; अमरत् 'he died'; अदरत् 'he tore'; आरुहत् 'he rose'. See Rig Veda (X. 85.17), (X. 44.6). The classical Aorist of these verbs are अकार्षीत्, अमृत, अदारीत् and अरुक्षत्.

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