2.2.21 तृतीयाप्रभृतीन्यन्यतरस्याम्

Word by word (padaccheda)

Substitute / term तृतीया- प्रभृतीनि prathamā · bahuvacanaRight context अन्यतरस्याम् 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

तृतीया-प्रभृतीनि अन्यतरस्याम्

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

Commentary

An उपपद ending in third case-affix 3.4.47 etc. is compounded optionally with an indeclinable formed by the affix अम् and the compound is तत्-पुरुष।
The term अम् is understood here. The upapadas ending with a third case-affix &c., are given in sutra 3.4.47 and the sutras that follow. As मूलकोपदंशं मुङ्क्ते or मूलकेनोपदंशं भुङ्क्ते 'he eats after having relished the food with radish.' So also पार्श्वोपपीड or पार्श्वयोरुपपीडम् शेते (Ill. 4.49) 'he lies pressing on his ribs.' For upapadas ending with other cases, see sutra 3.4.52 &c. This being an optional rule, it is not necessary that the upapada should be tulya-vidhana with the अम् ; so that this optional compounding may take place even under rule 3.4.59 where अम् is not the only affix enjoined, but there is क्त्वा as well. This vibhasha may therefore be called both प्राप्त and अप्राप्त vibhasha. It is प्राप्त with regard to those rules where अम् is the only affix employed; and it is अप्राप्त with regard to those where श्रम् is not the only affix.

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