6.1.73
छे च
Operational rule vidhi
A ह्रस्व स्वर gets a तुक्-आगमः when followed by a छकार, in the context of संहिता.
Word by word (padaccheda)
Right context छे saptamī · ekavacanaIndeclinable च avyaya
- 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").
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
छे च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The augment त् is added to a preceding short vowel also when छ follows an in an uninterrupted speech.
Thus इच्छति, गच्छति ॥ The त is change to च by 8.4.40. The short vowel itself is the आगमी (the thing to which the augment is added), and not the word ending in that short vowel. Therefore in चिच्छिदतुः, चिच्छिदुः, the augment is not to be considered as part of the Reduplicate चि, but of the short इ only; and therefore it is not elided by हलादिः शेष 7.4.60 rule applying to reduplicates. This follows on the maxim नावयवावयवः समुदायावयवो भवति "the part of a part cannot be considered as a part of the whole". Here त् is a part of the abhyasa syllable चि which is itself a part of the verbal base, therefore त् is not considered as an abhyasa: or because त् being an augment of इ is considered as part of इ and not of चि of which इ is the part.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.