4.1.13 डाबुभाभ्यामन्यतरस्याम्

Word by word (padaccheda)

Substitute / term डाप् prathamā · ekavacanaLeft context उभाभ्याम् pañcamī · dvivacanaRight context अन्यतरस्याम् saptamī · 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.
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

डाप् उभाभ्याम् अन्यतरस्याम्

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

Commentary

The affix डाप् comes optionally after both - 1. प्रातिपदिक (Nominal Stem) ending in अन् 2. बहुव्रीहि समास ।
Of the affix डाप्, the letter ड् indicates that the affix is to be added after the elision of the टि 1.1.64 of the base. Thus पामन् + डाप् = पाम् + आ = पामा, This being an optional rule we have I.s पामा d, पामे or पामानौ, pl, पामाः or पामानः; similarly with सीमा, as, सीमा, सीमे or सीमानौ, सीमाः or सीमानः ॥

So also in Bahuvrihi compounds ending in अम्. As:-

बहुराजा, बहुराजे or बहुराजानौ, बहुराजाः or बहुराजानः ॥
बहुतक्षा, बहुतक्षे or बहुतक्षाणौ, बहुतक्षाः or बहुतक्षाणः ॥

Why do we say "optionally" ? So that the option may apply to sutra 4.1.7 also; i. e. when a pratipadika ending in वन्, which can be regarded as ending in अन्, is a Bahuvrihi compound, then the change of न् into र् and the application of ङीप् are optional we may apply the affix डाप् instead. As:-
बहुधीवा or बहुधीवरी; बहुपीवा or बहुपीवरी ॥

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