पुषादिद्युताद्यॢदितः परस्मैपदेषु

Operational rule vidhi

For the verbs of पुषादिगण and द्युतादिगण, as well as for the ऌदित verbs, च्लि is converted to अङ् when followed by a प्रत्यय of परस्मैपद.

Word by word (padaccheda)

Left context पुषादि- द्युतादि- ऌदितः pañcamī · ekavacanaRight context saptamī · bahuvacana

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

पुषादि-द्युतादि-ऌदितः

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

Commentary

अङ् is the substitute of च्लि after the verbs पुष् 'to nourish' and the rest; द्युत् 'to shine' and the rest; and the verbs having an indicatory ऌ , when the affixes of the परस्मैपद follow.
The verbs classed as पुषादि, are a sub-division of the 4th conjugational verbs; and द्युतादि verbs belong to the Ist conjugation. As पुष्, अपुषत् 'he nourished'; द्युत्, अद्युतत् 'he shone'; गम्लृ, अगमत् 'he went'. But not so in the Atmanepada; as व्यद्योतिष्ट, अलोतिष्ट.

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