3.1.90
कुषिरजोः प्राचां श्यन् परस्मैपदं च
Operational rule vidhi
The affix श्यन् comes after the roots कुष् 'to pull' and रञ्ज 'to colour' in the reflexive voice, according to the opinion of Eastern Grammarians and these verbs take the affixes of परस्मैपद .
Word by word (padaccheda)
Target कुषि- रजोः ṣaṣṭhī · dvivacanaTarget प्राचाम् ṣaṣṭhī · bahuvacanaSubstitute / term य prathamā · 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".
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Pink letters are it-markers (anubandhas), tags dropped by 1.3.9. Hover or tap one for the rule that marks it, or try the it-letter finder.
Full reading
कुषि-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
कुषि-
Replace kuṣi-rajoḥ prācām with śyan parasmaipadam. Inherited words (anuvṛtti) may add further conditions.
Commentary
The affix श्यन् comes after the roots कुष् 'to pull' and रञ्ज 'to colour' in the reflexive voice, according to the opinion of Eastern Grammarians and these verbs take the affixes of परस्मैपद ।
This debars the affix यक् and the Atmanepada terminations. As कुष्यति पादः स्वयमेव 'the foot draws up of itself'; रज्यति वस्त्रं स्वयमेव 'the cloth colours of itself'.
The phrase 'in the opinion of the Eastern' shows that it is an optional rule; so that we have also the forms कुष्यते and रज्यते.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.