उत्तराधरदक्षिणादातिः

Operational rule vidhi

The affix अति is added to the words 1. उत्तर and 2. दक्षिण in the sense of अस्ताति.

Word by word (padaccheda)

Left context उत्तर- अधर- दक्षिणात् pañcamī · ekavacanaSubstitute / term आतिः prathamā · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

उत्तर-अधर-दक्षिणात् आतिः

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

Commentary

The affix अति is added to the words 1. उत्तर and 2. दक्षिण in the sense of अस्ताति।
Thus उत्तरस्यां दिशि वसति = उत्तराद्वसति; उत्तरादागतः, उत्तराद्रमणीयम् ॥ Similarly अधरात् and दक्षिणात् ॥

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