2.4.74
यङोऽचि च
Operational rule vidhi
And there is diversely the लुक् elision of यङ् -- धातोरेकाचो हलादेः क्रियासमभिहारे यङ् (3.1.22), when the affix अच् -- नन्दिग्रहिपचादिभ्यो ल्युणिन्यचः (3.1.134), follows.
Word by word (padaccheda)
Target यङः ṣaṣṭhī · ekavacanaRight context अचि saptamī · ekavacanaIndeclinable च avyaya
- 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").
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
यङः अचि च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
And there is diversely the लुक् elision of यङ् -- धातोरेकाचो हलादेः क्रियासमभिहारे यङ् 3.1.22, when the affix अच् -- नन्दिग्रहिपचादिभ्यो ल्युणिन्यचः 3.1.134, follows.
By using 'diversely' there is elision of यङ् when other affixes than अच् follow, both in the sacred and profane literature; as लोलुवः 'much cutter' (लोलुव + अव्); पोपुवः 'much purifier' समीत्रंसः from स्रंस 'to drop.' दनीध्वंसः from ध्वंस 'to fall,' the नी being added by 7.4.84.
So also यङ् is elided before other affixes than अच् : thus शाकुनिकी लालपीति दुन्दुभिवीवदीति ॥ See also 1.1.4.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.