स्वं स्वामिनि

Operational rule vidhi

The first member of a तत्-पुरुष समास preserves its original accent when it denotes a thing possessed and when its second term is स्वामिन्.

Word by word (padaccheda)

Substitute / term स्वम् prathamā · ekavacanaRight context स्वामिनि 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

स्वम् स्वामिनि

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 it denotes a thing possessed and when its second term is स्वामिन्।
Thus गो꣡स्वामी, अ꣡श्वस्वामी, ध꣡नस्वामी ॥ The accents of गौ, अश्व and धन have already been mentioned before in 6.2.14. When the first member is not a word denoting possession, we have परमस्वामी ॥

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