गर्तोत्तरपदाच्छः

Operational rule vidhi

The affix छ comes in the remaining senses after a प्रातिपदिक (Nominal Stem) denoting a place and having the word गर्त as its second term.

Word by word (padaccheda)

Left context गर्त- उत्तरपदात् pañcamī · ekavacanaSubstitute / term छः 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.

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Full reading

गर्त-उत्तरपदात् छः

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

Commentary

The affix छ comes in the remaining senses after a प्रातिपदिक (Nominal Stem) denoting a place and having the word गर्त as its second term.
This debars अण् ॥ The word देशे is to be read into the sutra. This rule being a subsequent one debars the affixes ठञ् and ञिठ् of sutra 117 ante. Thus वृकगर्तीयं, शृगालगर्तीयम्, श्वाविद्गर्तीयम् 'born in porcupine's hole &c'. The word उत्तरपद is used in the sutra, so as to prevent the application of the rule to a word which ends in गर्त, but is preceded by the affix बहु, as बाहुगर्तम् ॥ Here बहु is an affix 5.3.68 and not a pada.

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