4.4.42
प्रतिपथमेति ठंश्च
Operational rule vidhi
The affix ठन् and ठक् comes after the word प्रतिपथम् , in the Accusative -2nd case in construction in the sense of 'who goes'.
Word by word (padaccheda)
Object प्रतिपथम् dvitīyā · ekavacanaVerb एति tiṅantaSubstitute / term prathamā · ekavacanaIndeclinable च avyaya
- Object Dvitīyā (2nd case).
- Verb A finite verb form (tiṅanta).
- 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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Full reading
प्रतिपथम् एति ठन् च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix ठन् and ठक् comes after the word प्रतिपथम् , in the Accusative -2nd case in construction in the sense of 'who goes'.
Thus प्रतिपथमेति = प्र꣡तिपथिकः or प्रातिपथिकः꣡ "who goes along the road" the ठक् causes Vriddhi 7.2.118 whilst ठन् does not.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.