अदभ्यस्तात्

Operational rule vidhi

झकार of the प्रत्यय that follows an अभ्यस्त is converted to अत्.

Word by word (padaccheda)

Substitute / term अत् prathamā · ekavacanaLeft context pañcamī · ekavacana

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

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Full reading

अत्

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

Commentary

अत् is the substitute of झ after a reduplicated verbal अङ्ग (stem).
As द꣡दति, ददतु, दधति, दधतु; जक्षति, जक्षतुः जाग्रति, जाग्रतु ॥ This अत् is replaced by जुस्, as अददुः, अदधुः ॥ Here also the accent will be on the first syllable of the substitute. Thus अ꣡ति, अ꣡त, अ꣡ते, अ꣡तु, अ꣡ताम् in the subsequent sutras. The accent of the reduplicates, however, is governed by 6.1.189, (अभ्यस्तानामादिः) ॥

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