3.3.49 उदि श्रयतियौतिपूद्रुवः

Word by word (padaccheda)

Right context उदि saptamī · ekavacanaLeft context श्रयति- यौति- पू- द्रुवः pañcamī · ekavacana

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").
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

उदि श्रयति-यौति-पू-द्रुवः

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

Commentary

The affix घञ् comes after the verbs 1. श्रि 2. यु 'to join' 3. पू 'to purify' 4. द्रु 'to run' when the preposition उत् is in composition.
This debars the affix ach 3.3.56. Thus उच्छ्रायः 'rising of a planet'; उद्यावः 'mixing'; उत्पावः 'purifying ghee'; and उद्रावः 'flight'.

How do you explain the form समुच्छ्रयः in पतनान्ताः समुच्छ्रयाः ? The word विभाषा 'optionally' in the next sutra, exerts a retrospective effect on this sutra, and the form is an optional one. This is a most unusual thing and is called सिंहावलोकनन्यायः 'the maxim of the lion's backward glance'. It is used when one casts a retrospective glance at what he has left behind, while at the same time he is proceeding, just as the lion, while going onward in search of prey, now and then bonds his neck backwards to see if any thing be within its reach.

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