इकः सुञि

Operational rule vidhi

In a मन्त्र the finals of the preceding member ending in इ or उ are lengthened before the particle सु.

Word by word (padaccheda)

Target ṣaṣṭhī · ekavacanaRight context सुञि saptamī · ekavacana

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").

Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.

Full reading

सुञि

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

Commentary

In a मन्त्र the finals of the preceding member ending in इ or उ are lengthened before the particle सु।
Thus अभी षु णः सखीनाम् (Rig. IV. 31.3) उर्ध्व ऊ षुण उतये (Rig I.36.13). The स is changed to ष by 8.3.107: and न changed to ण by 8.4.27.

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