"thud" in the noun sense
1. thump, thumping, clump, clunk, thud
a heavy dull sound (as made by impact of heavy objects)
"thud" in the verb sense
1. thud, thump
make a dull sound
"the knocker thudded against the front door"
strike with a dull sound
"Bullets were thudding against the wall"
3. crump, thud, scrunch
make a noise typical of an engine lacking lubricants
Source: WordNet® (An amazing lexical database of English)
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