noun
a dull thud or heavy sound made by something falling or hitting the ground
verb
to fall or drop heavily with a dull thud
adverb
in a heavy, dull manner
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The heavy snow caused a loud flump as it fell from the roof.
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I heard a flump when the cat jumped off the bed.
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I flumped down on the couch after a long day at work.
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The news of the company's bankruptcy hit him like a flump.