accusative singular neuter past participle of ārabhati (or possible nominative singular neuter of the gerundive, depending on syntactic role)
Analysis. ā- (toward the speaker, up to a point) + rabhati (√rabh, to seize, grasp); literally 'seized toward', hence begun or undertaken.
Etymology. √rabh (to seize, grasp) with prefix ā- reversing its direction of motion. Cognate: Latin rapere 'to seize'. The prefix ā- here marks the completion or direction of the action toward a threshold or endpoint.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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