दाधेट्सिशदसदो रुः

Operational rule vidhi

The affix रु comes after the verbs 1. दा 'to give' 2. धेट् 'to suck' 3. सि 'to bind' 4. शद 'to fall' 5. सद् 'to sit'.

Word by word (padaccheda)

Left context दा- धेट्- सि- शद- सदः pañcamī · ekavacanaSubstitute / term रुः prathamā · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

दा-धेट्-सि-शद-सदः रुः

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

Commentary

The affix रु comes after the verbs 1. दा 'to give' 2. धेट् 'to suck' 3. सि 'to bind' 4. शद 'to fall' 5. सद् 'to sit'.
As, दारुः 'munificent man'; धारुर्वत्सो मातरम् 'a sucking child of the mother'. The genitive case is here prohibited by 2.3.69, the रु being taken as equivalent to उ. As सरुः 'binding'; शद्रुः 'falling'; and सद्रुः 'resting'.

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