विध्वरुषोस्तुदः

Operational rule vidhi

The affix खश् comes after the verb तुद् 'to strike' when विधु 'the moon' or अरुस् 'a wound' is the word in composition with it as object.

Word by word (padaccheda)

Right context विध्व- रुषोः saptamī · dvivacanaLeft context तुदः pañcamī · ekavacana

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").
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.

Full reading

विध्व-रुषोः तुदः

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

Commentary

The affix खश् comes after the verb तुद् 'to strike' when विधु 'the moon' or अरुस् 'a wound' is the word in composition with it as object.
As विधुन्तुदः राहुः 'the Rahu that eclipses the moon; अरुन्तुदः 'corrosive, wounding the vital parts'. For the addition of the augment मुम् after the word अरुस्, see 6.3.67.

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