past participle (nominative singular masculine) of upasantati; surface form upasantoti = upasanto + iti (it is calmed)
Analysis. upasanto (past participle, nominative singular masculine of upasantati 'becomes calm') + iti (quotative particle 'thus, it is'). The form appears in the fixed phrase as a description or nominal utterance.
Etymology. upa- (up close to, near; approaching and settling) + sam- (together, completely; bringing into one) + anti (from √am 'to go, to move'), giving the sense 'drawing near and settling together': the concrete imagery of fire or agitation cooling as one approaches rest. Related to Sanskrit upashānta- and the root √śam (calm, pacify), cognate with English same and Latin similis.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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