2.4.77
गातिस्थाघुपाभूभ्यः सिचः परस्मैपदेषु
Operational rule vidhi
For the verb roots गा, स्था, पा, भू and the verb roots referred as 'घु', the सिच्-विकरण is removed when followed by the प्रत्यय of परस्मैपद.
Word by word (padaccheda)
Left context गाति- स्था- - पा- भूभ्यः pañcamī · bahuvacanaTarget सिचः ṣaṣṭhī · ekavacanaRight context saptamī · bahuvacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- 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
गाति-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
There is लुक् elision of the affix सिच् -- च्लेः सिच् 3.1.44 in the परस्मैपद after the verbs गा 'to go', स्था 'to stand', the verbs called घु मृषस्तितिक्षायाम् 1.2.20, पा 'to drink' and भू 'to be'.
गा is the substitute of इण् 2.4.45. सिच् the affix of the Aorist is elided after these verbs in the Parasmaipada as जगात् 'he went, अस्थात् 'he stood,' अदात् 'he gave,' अघात् 'he held,' अपात् 'he drank,' अभूत् 'he was.'
Vart:- The verbs गा and पा in the aphorism mean the गा 'to go' (which is the substitute of इण्, and not गै 'to sing,') which also assumes the form गा, and पा 'to drink' and not पा 'to protect.' The verbs गा 'to sing' and पा 'to protect' will form their Aorist with सिच् without its elision; thus अगासीत् 'he sang,' अपासीत् 'he protected.'
In the Atmanepada the सिच् is not elided; thus अगासातां ग्रामौ देवदत्तेन.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.