न रुधः

Operational rule vidhi

चिण् is not the substitute of च्लि after the verb रुध् 'to obstruct' when used in the reflexive sense in the 3rd Person Singular of आत्मनेपद .

Word by word (padaccheda)

Indeclinable न avyayaLeft context रुधः pañcamī · ekavacana

Indeclinable An avyaya such as च "and", वा "optionally", न "not".
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

न रुधः

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

Commentary

चिण् is not the substitute of च्लि after the verb रुध् 'to obstruct' when used in the reflexive sense in the 3rd Person Singular of आत्मनेपद ।
Thus अन्ववारुद्ध गौ स्वयमेव 'the cow was obstructed of itself'. In verbs other than reflexive, चिण् is employed, e. g. अन्ववारोधि गौर्गोपालकेन.

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