कष्टाय क्रमणे

Operational rule vidhi

The affix क्यङ् in the sense of exerting in the dishonesty, is employed after the word कष्ट 'mischief' when the latter has the 4th case-affix in construction.

Word by word (padaccheda)

For कष्टाय caturthī · ekavacanaRight context क्रमणे saptamī · ekavacana

For Caturthī (4th case).
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").

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Full reading

कष्टाय क्रमणे

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

Commentary

The affix क्यङ् in the sense of exerting in the dishonesty, is employed after the word कष्ट 'mischief' when the latter has the 4th case-affix in construction.
Thus, कष्टाय कर्मणे क्रामति = कष्टायते 'he is assiduous for trouble, i.e. he is assiduous in the commission of dishonesty, or he plots'.

Vart:- The affix क्यङ्, comes in the sense of exerting in evil, after the words सत्र, कष्ट, कक्ष, कृच्छ्र and गहन; as, सत्रायते, कष्टायते, कक्षायते, कृच्छ्रायते, and गहनायते ।

When the sense is not of 'evil', the affix is not added, as अजः कष्टं क्रामति.

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