Etymology
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thunk (n.)

sound of impact, attested from 1952, echoic.

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.

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Definitions of thunk

thunk (n.)
a dull hollow sound;
the basketball made a thunk as it hit the rim
From wordnet.princeton.edu