इण्निष्ठायाम्

Operational rule vidhi

The augment इट् is added to the Participial affixes त and तवत् after कुष् when it is preceded by निर्.

Word by word (padaccheda)

Substitute / term इट् prathamā · ekavacanaRight context निष्ठायाम् saptamī · ekavacana

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

इट् निष्ठायाम्

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

Commentary

The augment इट् is added to the Participial affixes त and तवत् after कुष् when it is preceded by निर्।
As निष्कुषितवान्, निष्कुषितः ॥ The special mention of इट् in the sutra is for the sake of making its addition invariable, otherwise it would have been
optional, or debarred by 7.2.15. In the subsequent sutra, the addition becomes again optional.

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