3.2.147
देविक्रुशोश्चोपसर्गे
Operational rule vidhi
The affix वुञ् comes after the verbs देवि 'to lament' and क्रुश 'to cry' when an उपसर्ग is in composition with them.
Word by word (padaccheda)
Target देवि- क्रुशोः ṣaṣṭhī · dvivacanaIndeclinable च avyayaRight context saptamī · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
- 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
देवि-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix वुञ् comes after the verbs देवि 'to lament' and क्रुश 'to cry' when an उपसर्ग is in composition with them.
As आदेवकः 'one who sports or laments'; आक्रोशकः 'vociferous, a reviler'; परिदेवकः 'one who laments'; परिक्रोशकः 'a reviler'.
Why do we say 'when in composition with an upasarga'? Observe देवयिता and क्रोष्ठा formed by तृन् 3.2.135.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.