अनुगादिनष्ठक्

Operational rule vidhi

The affix ठक् comes after the word अनुगादिन , without changing its sense.

Word by word (padaccheda)

Left context अनुगादिनः 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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अनुगादिनः ठक्

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

The affix ठक् comes after the word अनुगादिन , without changing its sense.
Thus आनुगादिकः "repeater or who echoes back".

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