ताच्छील्यवयोवचनशक्तिषु चानश्

Operational rule vidhi

The affix चानश् comes after a verb in expressing 'habit', standard of age' and 'inability'.

Word by word (padaccheda)

Right context ताच्छील्य- वयोवचन- शक्तिषु saptamī · bahuvacanaSubstitute / term आन prathamā · 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").
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

ताच्छील्य-वयोवचन-शक्तिषु चानश्

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

Commentary

The affix चानश् comes after a verb in expressing 'habit', standard of age' and 'inability'.
The word ताच्छील्य means 'habit' or 'disposition'; वयः means the condition of body such as 'infancy', 'youth' & c; शक्ति means 'capacity to do a thing'. As भोगं भुञ्जानः 'habituated to enjoy'; कवचं बिभ्राणः 'wearing an armour (of the age at which armour may be worn)'; शत्रुं निघ्नानः 'able to destroy his foe'. So also, कतीह मुण्डयमानाः, भूषयमानाः, कवचं पर्यस्यमानाः, शिखण्डं वहमानाः and पचमानाः।

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