गोपुच्छाट्ठञ्

Operational rule vidhi

The affix ठञ् comes after the word गोपुच्छ in the sense of 'he crosses thereby'.

Word by word (padaccheda)

Left context गोपुच्छात् pañcamī · ekavacanaSubstitute / term 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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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

गोपुच्छात् ठञ्

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

Commentary

The affix ठञ् comes after the word गोपुच्छ in the sense of 'he crosses thereby'.
The difference between ठक् and ठञ् is in the accent. Thus गौपुच्छिकः ॥

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