6.4.63 दीङो युडचि क्ङिति

Word by word (padaccheda)

Left context दीङः pañcamī · ekavacanaSubstitute / term युट् prathamā · ekavacanaRight context saptamī · ekavacanaSubstitute / term क्ङिति 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.
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").

Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.

Full reading

दीङः युट् क्ङिति

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

Commentary

युट् is the augment of दीङ् of an आर्धधातुक affix beginning with a vowel and having an indicatory क् or ङ्।
Thus उपदिदीये, उपदिदीयाते and उपदिदीयिरे ॥ The Personal ending is कित् by 1.2.5. दीङः being in the Ablative case, the augment is applied to the affix. This augment, however, is not to be considered as asiddha 6.4.22 for the purposes of semi-vowel substitution under 6.4.82. If that substitution were allowed, the augment would become useless. Why before an affix having क् or ङ् ? Observe उपदानम् ॥

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