नित्यं करोतेः

Operational rule vidhi

The उकार occurring at end of a प्रत्यय that is attached to the verb root कृ is removed when followed by a मकार or a वकार.

Word by word (padaccheda)

Substitute / term नित्यम् prathamā · ekavacanaLeft context करोतेः pañcamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

नित्यम् करोतेः

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

Commentary

The elision of उ is invariable before व् and म् in the case of कृ 'to make' (करोति).
Thus कुर्वः and कुर्मः ॥ Thus कृ + उ + व = कुर् + उ + वः 6.4.110 = कुर् + ० + वः 6.4.108. Now the lopa being not sthanivat, when a vowel is to be lengthened 1.1.58, उ of कु should be lengthened by 8.2.77. This contingency is prevented by 8.2.79.

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