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thunk (n.)
[thunk 词源字典]
sound of impact, attested from 1952, echoic.
[thunk etymology, thunk origin, 英语词源]
thunk (v.)
dialectal or jocular past tense or past participle of
think
, by 1876. Not historical, but by analogy of
drink
/
drunk
,
sink
/
sunk
, etc.