भृञामित्

Operational rule vidhi

In the Reduplicated Present form (श्लु) of the three roots 1. भृ 2. मा (माङ्) and 3. हा (ओहाङ्), इ is substituted for the vowel of the reduplicate.

Word by word (padaccheda)

Target भृञाम् ṣaṣṭhī · bahuvacanaSubstitute / term prathamā · ekavacana

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

भृञाम्

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

As a rewrite rule (sketch from case endings)

भृञाम् →

Replace bhṛñām with it. Inherited words (anuvṛtti) may add further conditions.

Commentary

In the Reduplicated Present form (श्लु) of the three roots 1. भृ 2. मा (माङ्) and 3. हा (ओहाङ्), इ is substituted for the vowel of the reduplicate.
As बिभर्त्ति, मिमीते, 6.4.113 जिहीते ॥ The word 'three' is understood here, therefore not in ओहाक्-जहाति ॥ The rule applies in the Reduplicated Present system (श्लु) only: therefore not in बभार ॥

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