आ च हौ

Operational rule vidhi

The verb root 'हा' gets an optional इकारादेश or an आकारादेश when followed by the प्रत्यय 'हि'.

Word by word (padaccheda)

Word आ Indeclinable च avyayaRight context हौ saptamī · ekavacana

Word Case not marked in the source data.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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").

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Full reading

आ च हौ

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

Commentary

आ and इ are optionally substituted for the final of the अङ्ग (stem) of हा (जुहोत्यादिगणः (3rd Conjugation)) before the Imperative ending हि।
Thus जहाहि, जहिहि or जहीहि 6.4.113.

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