भियः क्रुक्लुकनौ

Operational rule vidhi

The affixes क्रु and क्लुकन come in the sense of 'agent having such a habit etc.' after the verb भी 'to fear'.

Word by word (padaccheda)

Left context भियः pañcamī · ekavacanaSubstitute / term क्रु- क्लुकनौ prathamā · dvivacana

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

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Full reading

भियः क्रु-क्लुकनौ

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

Commentary

The affixes क्रु and क्लुकन come in the sense of 'agent having such a habit etc.' after the verb भी 'to fear'.
As, भीरुः 'fearful, timid'; भीलुकः 'timorous, a bear, a tiger, a jackal'.
Vart:- The affix क्रुकन् should also be stated; as भीरुकः ।

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