यजजपदशां यङः

Operational rule vidhi

The affix ऊक comes in the sense of 'agent having such a habit etc.' after the verbs 1. यज् 2. जप् 3. दश् when they end in the affix य्.

Word by word (padaccheda)

Target यज- जप- दशाम् ṣaṣṭhī · bahuvacanaLeft context यङः pañcamī · ekavacana

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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

यज-जप-दशाम् यङः

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

Commentary

The affix ऊक comes in the sense of 'agent having such a habit etc.' after the verbs 1. यज् 2. जप् 3. दश् when they end in the affix य्।
The intensives of these verbs take ऊक. As यायजूकः 'a performer of frequent sacrifices'; जञ्जपूकः 'a mutterer of prayers repeatedly'; दन्दशूकः 'a snake (what bites frequently)'.

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