6.3.138
चौ
Operational rule vidhi
When the अञ्च् word is in a state where its अकार and नकार have been removed, it causes the दीर्घ of the previous अण् letter.
Word by word (padaccheda)
Right context चौ saptamī · ekavacana
- 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
चौ
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The final vowel of the preceding member is lengthened before अञ्च when it assumes the form च having lost its nasal and the vowel.
Thus दधीचः पश्य, दधीचा, दधीचे, मधूचः पश्य, मधूचा, मधूचे ॥ The nasal of अञ्च is elided by 6.4.24, and the अ by 6.4.138. In दधि + अच् the इ is not changed to its semivowel, though that is an antaranga rule, because the present sutra ordains specifically long ई, and so also दधी + अच् and मधू + अच् ॥ See also 6.3.92.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.