5.4.106
द्वन्द्वाच्चुदषहान्तात् समाहारे
Operational rule vidhi
The affix टच् comes after a द्वन्द समास denoting in a palatal or a द् or ष् or ह् when the compound is a समाहार द्वन्द (collective noun taken as a unity).
Word by word (padaccheda)
Left context pañcamī · ekavacanaLeft context चु- द- ष- हान्तात् pañcamī · ekavacanaRight context समाहारे saptamī · ekavacana
- 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
चु-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix टच् comes after a द्वन्द समास denoting in a palatal or a द् or ष् or ह् when the compound is a समाहार द्वन्द (collective noun taken as a unity).
The anuvritti of Tatpurusha which commenced at 5.4.86, ceases. The rule applies to समाहारद्वन्द्व "an aggregate Dvandva" which is always in Neuter singular; and not to इतरेतरद्वन्द्व "or mutual conjunction". Thus वाक् च त्वक् च = वाक्त्वचम्, so also स्रक्त्वचम्, श्रीस्रजम्, इडूर्जम्, वागूर्जम्, समिद्दृषदम्, संपद्विपदम्, वाग्विप्रुषम्, छत्रोपानहम्, धेनुगोदुहम् ॥
Why do we say "after a Dvandva"? The affix will not come after a Tatpurusha, as, पंच वाचः समाहृताः = पंचवाक् ॥ Why do we say "when ending in a consonant of च class, or द, ष and ह"? Observe वाक्समित् ॥ Why do we say "in a Samahara Dvandva"? Observe प्रावृट्शरदौ ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.