साढ्यै साढ्वा साढेति निगमे

Operational rule vidhi

1. साढ्यै 2. साढ्वा and 3. साढा are irregularly formed in the छन्दस् (Vedas).

Word by word (padaccheda)

Indeclinable साढ्यै avyayaIndeclinable साढ्वा avyayaSubstitute / term साढा prathamā · ekavacanaIndeclinable avyayaRight context निगमे saptamī · ekavacana

Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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

साढ्यै साढ्वा साढा निगमे

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

Commentary

1. साढ्यै 2. साढ्वा and 3. साढा are irregularly formed in the छन्दस् (Vedas).
Thus साढ्यै समन्तात्, साढ्वा शत्रून् ॥ The latter is formed by क्त्वा affix, the ओ substitution not taking place. In the other alternative क्त्वा is changed to धौ ॥ साढा is formed by तृच् affix. In the secular literature सोढा and सोढ्वा the proper forms.

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