वेः शालच्छङ्कटचौ

Operational rule vidhi

The affixes शालच् (शाल) and शङ्कटच् (शङ्कट) come after the preposition वि without changing the sense.

Word by word (padaccheda)

Left context वेः pañcamī · ekavacanaSubstitute / term शालच्- शङ्कटचौ prathamā · dvivacana

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.

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Full reading

वेः शालच्-शङ्कटचौ

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

Commentary

The affixes शालच् (शाल) and शङ्कटच् (शङ्कट) come after the preposition वि without changing the sense.
Thus विगते शृङ्गे = विशाले, विशंकटे ॥ Thus these words may apply to a cow, as विशालः, विशंकटः ॥ According to some these words are adjectives meaning 'great, large' &c. There is no connection here of sense of base and the affix.

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