गुणो यङ्लुकोः

Operational rule vidhi

गुण is substituted for the final of इ and उ (with their long) of a reduplicate when the Intensive character यङ् follows and also when it is elided.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaRight context यङ्लुकोः saptamī · dvivacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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

यङ्लुकोः

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

Commentary

गुण is substituted for the final of इ and उ (with their long) of a reduplicate when the Intensive character यङ् follows and also when it is elided.
Thus चेचीयते, लोलूयते with यङ्, and जोहवीति with यङ् लुक् ॥ The ईट् is added in the latter by 7.3.94. So also चोक्रुशीति from क्रुश् 7.3.94 and 7.3.87.

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