4.3.15
श्वसस्तुट् च
Operational rule vidhi
The affix ठञ् comes optionally comes in the remaining senses after the word श्वस् and it takes the augment तुट्.
Word by word (padaccheda)
Left context श्वसः pañcamī · ekavacanaSubstitute / term तुट् prathamā · ekavacanaIndeclinable च avyaya
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
श्वसः तुट् च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix ठञ् comes optionally comes in the remaining senses after the word श्वस् and it takes the augment तुट्।
The word श्वस् takes the affix त्यप् by sutra 4.2.10. This sutra ordains ठञ् ॥ When free from the scope of these rules, it takes tyu and tyul affixes also by 4.3.23. Thus श्वस् + तुट् + ठञ् = शौवस् + त् + इक 7.3.3 = शौवस्तिकः "belonging to to-morrow or ephemeral". Otherwise श्वस्त्यः and श्वस्तनः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.