7.4.59
ह्रस्वः
Operational rule vidhi
अभ्यास is converted to ह्रस्व.
Word by word (padaccheda)
Substitute / term prathamā · ekavacana
- 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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Full reading
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
A short is substituted for the long vowel of the reduplicate.
As डुढौकिषते, तुत्रौकिषते, डुढौके, तुत्रौके, अडुढौकत्, अतुत्रौकत् ॥
Vart:- The shortening takes place before affixes other than अच् 3.1.134 Before अच्, the roots चर्, चल्, पत् and वद् are reduplicated, and the augment अक् added to the reduplicate. See 6.1.12 Vartika. This augment when added to the reduplicate, is not to be shortened by this rule: and because this is not to be shortened, also indicates that the consonants of the reduplicate other than the first are also not dropped: as चराचरः, चलाचलः, पतापतः, वदावदः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.