सवाभ्यां वामौ

Operational rule vidhi

An एकार coming after a सकार or a वकार of प्रत्यय of लोट्लकार is respectively converted to व and अम्.

Word by word (padaccheda)

Left context स- वाभ्याम् pañcamī · dvivacanaSubstitute / term व- अमौ prathamā · dvivacana

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.

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

स-वाभ्याम् व-अमौ

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

Commentary

For such an ए coming after स् , is substituted व् and for that coming after व् , is substituted अम् , in the (Imperative Mood).
This supersedes the आम् substitution of the last sutra. Thus, for से we have स्व, and for ध्वे we have ध्वम्; see the table; thus पचस्व, पचध्वम् ।

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