6.2.16
प्रीतौ च
Operational rule vidhi
The first member of a तत्-पुरुष समास preserves its original accent when its second term is सुख or प्रिय and the sense is 'agreeable to one' or 'desired'.
Word by word (padaccheda)
Right context प्रीतौ saptamī · ekavacanaIndeclinable च avyaya
- 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").
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
प्रीतौ च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The first member of a तत्-पुरुष समास preserves its original accent when its second term is सुख or प्रिय and the sense is 'agreeable to one' or 'desired'.
Thus ब्राह्मणसुखं पायसं "the sweet milk desired by or agreeable to the Brahmanas", छात्रप्रियोऽनध्यायः ॥ कन्याप्रियो मृदङ्गः ॥ &c. The words ब्राह्मण and छात्र have acute on the final being formed by the affixes अण् and ण 5.4.62 respectively 3.1.3 and कन्या has svarita on the final. When not meaning agreeable to or desired, we have राजसुखम्, राजप्रियम् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.