पदोत्तरपदं गृह्णाति

Operational rule vidhi

The affix ठक् comes in the sense of 'who takes' after a word having पद as its second member, the word being in the Accusative -2nd case in construction.

Word by word (padaccheda)

Object - उत्तरपदम् dvitīyā · ekavacanaVerb गृह्णाति tiṅanta

Object Dvitīyā (2nd case).
Verb A finite verb form (tiṅanta).

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

-उत्तरपदम् गृह्णाति

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

Commentary

The affix ठक् comes in the sense of 'who takes' after a word having पद as its second member, the word being in the Accusative -2nd case in construction.
Thus पूर्वपदं गृह्णाति = पौर्वपदिकः, so also औत्तरपदिकः ॥ The word उत्तरपद is used in order to prevent the application of the rule when पद is preceded by the affix बहु ॥

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