3.3.62
स्वनहसोर्वा
Operational rule vidhi
The affix अप् comes optionally after the verbs 1. स्वन् 2. हस् when no उपसर्ग is in composition with them.
Word by word (padaccheda)
Target स्वन- हसोः ṣaṣṭhī · dvivacanaIndeclinable वा avyaya
- 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".
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Full reading
स्वन-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix अप् comes optionally after the verbs 1. स्वन् 2. हस् when no उपसर्ग is in composition with them.
Thus स्वनः or स्वानः 'sound'; हसः or हासः 'laughter'. But with upasargas, we have only one form; प्रस्वानः 'a loud noise'; प्रहासः 'a loud laughter'.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.