pr 3rd sg of vinassati (verb)
Analysis. vi + √nas: 'falls apart' or 'comes asunder', the root √nas meaning to perish or be destroyed, with the prefix vi- indicating the direction of that destruction—literally 'apart-perishes', hence the sense of complete disintegration.
Etymology. √nas (to perish, be destroyed) with prefix vi- (apart, asunder). The root nas is cognate with English 'nostalgia' (from Greek nostos 'return home') only in superficial form; the true sense lies in the root's meaning of decay and dissolution. In doctrine, vinassati is the natural endpoint of all conditioned things (saṅkhāra): impermanence (anicca) means each phenomenon inevitably vinassati.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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