इच् कर्मव्यतिहारे

Operational rule vidhi

The affix इच् comes after a बहुव्रीहि समास when the compound denotes the reciprocity of an action.

Word by word (padaccheda)

Substitute / term इच् prathamā · ekavacanaRight context कर्मव्यतिहारे saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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

इच् कर्मव्यतिहारे

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

Commentary

The affix इच् comes after a बहुव्रीहि समास when the compound denotes the reciprocity of an action.
The compound denoting reciprocity of action is formed by 2.2.27. Thus केशाकेशि = केशेषु केशेषु गृहीत्वा इदं युद्धं प्रवृत्तं ॥ So also कचाकचि, मुसलामुसलि, दण्डादण्डि ॥ The affix इच् forms also avyayibhava compounds, as it occurs in the list of तिष्ठद्गु words 2.1.17.

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