विभाषोपयमने

Extension atideśa कित्त्वातिदेशः

The affix सिच् before आत्मनेपद affixes is कित् optionally when यम् means 'to expose'.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaRight context उप- यमने saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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

उप-यमने

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

Commentary

The affix सिच् before आत्मनेपद affixes is कित् optionally when यम् means 'to expose'.
Thus उपायत कन्याम् or उपायंस्त कन्याम् 'he espoused the girl,' उपायत or उपायंस्त भार्याम् 'he espoused his wife.'

The word 'Upayamana' in the sutra means 'to accept in marriage,' 'to espouse.' The verb यम् preceded by the preposition उप is Atmanepadi when it means 'to espouse' by Rule (1.3. 56).

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