1.3.91
द्युद्भ्यो लुङि
Operational rule vidhi
After the verbs द्युत् 'to shine' etc., the terminations of the परस्मैपद are optionally employed, when the affixes of लुण् (Aorist) follow.
Word by word (padaccheda)
Left context द्युद्भ्यः pañcamī · bahuvacanaRight context लुङि 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
द्युद्भ्यः लुङि
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
After the verbs द्युत् 'to shine' etc., the terminations of the परस्मैपद are optionally employed, when the affixes of लुण् (Aorist) follow.
The Dyutadi verbs are 22 in number, to be found in Dhatupatha in the Bhuadi class. By the use of the word द्युद्भ्यः in the plural in the sutra, the force is that of &c. These verbs are anudatta and so by sutra 1.3.12 they would have been invariably atmanepadi, this aphorism makes them optionally so in the aorist. Thus अद्युतत् or अद्योतिष्ठ he shone. In other tenses than the aorist (लुङ्) these verbs are invariably Atmanepadi. As द्योतते he shines.
For a list of Dyutadi verbs see Dhatupatha.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.