noun
a slang term for a thought or idea
verb
past tense of the verb 'think', meaning to have thought about something
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The scientist's experiment led to a significant breakthrough when he heard the thunk of the final piece falling into place.
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I heard a loud thunk coming from the kitchen, I wonder what my cat knocked over this time.
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I accidentally dropped my phone and it made a loud thunk on the floor.
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The weight of the decision thunked heavily on his mind as he tried to figure out the best course of action.