causative infinitive of sāretī, from denominative verb based on sāra (heartwood); here expressing purpose or direction
Analysis. sāra (heartwood, core, essence) + -etu (causative infinitive suffix), originally 'to make into heartwood', hence to strengthen or consolidate
Etymology. Related to Sanskrit śāra (essential, strong part). The underlying noun sāra means heartwood of a tree, concrete imagery of strength and durability extended to inner resilience. No clear Indo-European cognate.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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