अमु च च्छन्दसि

Operational rule vidhi

In the छन्दस् (Vedas) the affix अमु (अम्) also is added after the above, under similar circumstances.

Word by word (padaccheda)

Word अमु Indeclinable च avyayaRight context छन्दसि saptamī · ekavacana

Word Case not marked in the source data.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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

अमु च छन्दसि

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

Commentary

In the छन्दस् (Vedas) the affix अमु (अम्) also is added after the above, under similar circumstances.
To the word किम्, words ending in ए, finite verbs and indeclinable, when taking the comparative affixes तर and तम is added the affix अम् in the Vedas, when these words are used as adverbs. By the force of the word च 'also' in the sutra, the affix आमु is also included. Thus प्रतरम् नयामः ॥ or प्रतराम् वस्यः । प्रतर means प्रकृष्टतर ॥

The words ending in आम् and अम् are indeclinables as they are included in the class of Svaradi (1.1.37).

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