भुजन्युब्जौ पाण्युपतापयोः

Operational rule vidhi

भुज 'an arm' and न्युब्ज 'a kind of bodily disease' are irregularly formed without any change of their ज् before घञ्.

Word by word (padaccheda)

Substitute / term भुजन्युब्जौ prathamā · dvivacanaRight context पाण्युपतापयोः saptamī · dvivacana

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

भुजन्युब्जौ पाण्युपतापयोः

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

Commentary

भुज 'an arm' and न्युब्ज 'a kind of bodily disease' are irregularly formed without any change of their ज् before घञ्।
The word भुजः = भुज्यतेऽनेन, with घञ् 3.3.121. The irregularity consists in the absence of Guna, as well as of gutturalisation. न्युव्जिताः शरतेऽस्मिन् = न्युव्जः from the root उव्ज अर्जवे (Tudadi 20). The irregularity consists in the non-changing of ज ॥ When not meaning 'an arm' and 'a disease', we have भोगः, समुद्गः ॥

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