7.4.4
लोपः पिबतेरीच्चाभ्यासस्य
Operational rule vidhi
The penultimate vowel in the Causative अङ्ग (stem) पा 'to drink' is elided in the Aorist and for the vowel of the reduplicate there is substituted long ई.
Word by word (padaccheda)
Substitute / term prathamā · ekavacanaTarget पिबतेः ṣaṣṭhī · ekavacanaSubstitute / term ईत् prathamā · ekavacanaIndeclinable च avyayaTarget ṣaṣṭhī · ekavacana
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
पिबतेः ईत् च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
पिबतेः → ईत्
Replace pibateḥ abhyāsasya with lopaḥ īt. Inherited words (anuvṛtti) may add further conditions.
Commentary
The penultimate vowel in the Causative अङ्ग (stem) पा 'to drink' is elided in the Aorist and for the vowel of the reduplicate there is substituted long ई।
As पा + णि + अत् = पाय् + इ + अत् 7.3.37 = पाय् + अत् 6.4.51 = प्य् + अत् 7.4.8 = पप्य् + अत् 1.1.59 = पीप्यत् 7.4.4. Thus अपीप्यत्, अपीप्यताम्, अपीप्यन् ॥ When the penultimate आ is elided, there remains प् which cannot be reduplicated as having no vowel, but the elided आ is considered as sthanivat and thus पा is reduplicated. Sutra 7.4.80 establishes by implication the principle that the substitutes caused by णि are sthanivat. Thus भू + णि = भावि; in reduplicating, this भा will not be reduplicated, but भू, as बुभावि, भा = भू by sthanivad-bhava.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.