absolutive of suṇāti
Etymology. suṇāti is from the zero-grade root √śru (Sanskrit, also in Greek κλύ-ω klúō "hear" and English "shrill", which originally meant the piercing sound one hears). The absolutive -tvā marks a completed action before the main verb.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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