दम्भ इच्च

Operational rule vidhi

For the vowel of the root दम्भ् there is substituted इ as well as ई before सन् of the Desiderative when it begins with स्.

Word by word (padaccheda)

Target दम्भः ṣaṣṭhī · ekavacanaSubstitute / term prathamā · ekavacanaIndeclinable च avyaya

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.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

दम्भः च

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

As a rewrite rule (sketch from case endings)

दम्भः →

Replace dambhaḥ with it. Inherited words (anuvṛtti) may add further conditions.

Commentary

For the vowel of the root दम्भ् there is substituted इ as well as ई before सन् of the Desiderative when it begins with स्।
As धीप्सति or धिप्सति ॥ But दिदम्भिषति before the सेट्सन् ॥ The reduplication falls off by 7.4.58.

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