विभाषाऽकर्मकात्

Operational rule vidhi

After the verb रम् 'to sport', preceded by उप , परस्मैपद is optionally used, when employed intransitively.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaLeft context अकर्मकात् pañcamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

अकर्मकात्

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

Commentary

After the verb रम् 'to sport', preceded by उप , परस्मैपद is optionally used, when employed intransitively.
The last aphorism ordained parasmaipada absolutely. This declares an option under certain circumstances. As यावद्भुक्तमुपरमति or उपरमते, he desisted from or was quiet while it was eaten.

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