6.4.47
भ्रस्जो रोपधयोः रमन्यतरस्याम्
Operational rule vidhi
When followed by an आर्धधातुक प्रत्यय, रेफ and the उपधावर्ण of the the verb root gets the 'रम्' आगम.
Word by word (padaccheda)
Target भ्रस्जः ṣaṣṭhī · ekavacanaTarget र- उपधयोः ṣaṣṭhī · dvivacanaSubstitute / term रम् prathamā · ekavacanaRight context अन्यतरस्याम् saptamī · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- 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
भ्रस्जः र-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
भ्रस्जः र-
Replace bhrasjaḥ ra-upadhayoḥ with ram when anyatarasyām follows. Inherited words (anuvṛtti) may add further conditions.
Commentary
In the room of र् and the penultimate letter स् of the root भ्रस्ज , there is optionally the substitute रम् when an आर्धधातुक affix follows.
The र् and स् cease to exist and र takes their place. The substitute having an indicatory म् comes after the final vowel 1.1.49. Thus भ्रस्ज + तृ = भर्ज् + तृ = भर्ष्टा the ज being changed to ष by 8.2.36, and त to ट by 8.4.41. The other form will be भ्रष्टा; so also भर्ष्टुम् and भर्ष्टुम्, भ्रष्टव्यम् and भर्ष्टव्यम्, भ्रज्जनम् or भर्ज्जनम् ॥ But भृष्टः and भृष्टवान् by 6.1.16, in spite of this rule. The word उपदेश 6.4.37. is understood here also. The rule therefore applies to the simple root bhrasj as originally taught in the Dhatupatha, and not to any Derivative root from it. As the Intensive (यङ) is बरीभृज्यते ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.