6.1.90
आटश्च
Operational rule vidhi
When the आट्-आगम is followed by a अच्-letter, both of them are replaced by a single वृद्धि letter.
Word by word (padaccheda)
Left context आटः pañcamī · ekavacanaIndeclinable च avyaya
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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
आटः च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The वृद्धि is the single substitute when the augment आट् is followed by any vowel.
The anuvritti of एचि ceases : that of अचि however, is present. The vowel that is subsequent to the augment आट्, and the आट् which is precedent to a vowel-in the room of these two i. e. the आट् and the vowel-subsequent and precedent, the Vriddhi is the single substitute. The augment आट् is added to the roots beginning with a vowel, in the Imperfect, Aorist and Conditional Tenses 6.4.72 &c)). Thus ऐक्षिष्ट, ऐक्षत, ऐक्षिष्यत, औभीत्, और्द्ध्रीत्, औब्जीत् from roots ईक्षदर्शने (Bhvadi. 641), उभ उम्भ पूरणे (Tudadi. 32) and उ ब्ज आर्जवे (Tudadi. 20). According to Siddhanta Kaumudi the आट् is the augment which ङित् case-affixes take after nadi-words 7.3.112. According to him the following are the examples:- बहुश्रेयसी + आट् + ङे = बहुश्रेयस्यै (Dative Singular). The आट् is the augment also in the Vedic Tense लेट् ॥
The च् 'and' in the sutra shows that the पररूप rule, taught in 6.1.95, 6.1.96 when उस्, ओं and आङ् follow, is superseded, when the preceding vowel is आट् ॥ Thus औस्रीयत्, औकारीयत् ॥ आ + ऊढा = ओढा, तामैच्छत् = औढीयत् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.