ससूवेति निगमे

Operational rule vidhi

In the छन्दस् (Vedas) ससूव is irregularly formed in the लिट् (Perfect Tense).

Word by word (padaccheda)

Verb ससूव tiṅantaIndeclinable avyayaRight context निगमे saptamī · ekavacana

Verb A finite verb form (tiṅanta).
Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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

ससूव निगमे

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

Commentary

In the छन्दस् (Vedas) ससूव is irregularly formed in the लिट् (Perfect Tense).
It is derived from सू ॥ Thus ससूव स्थविरं विपश्चिताम् otherwise सुषुवे ॥ Rig. IV. 1.10.

This word ससूव might well have been included in sutra 7.4.65.

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