thunk

noun

1. an abrupt, dull sound: the thunk of a shutting window.

verb (used without object)

2. to make such a sound: The window thunked shut.

verb Nonstandard.

1. a simple past tense and past participle of think1.

noun, verb

1. informal another word for thud

sound of impact, attested from 1952, echoic.