definition of
thud

[1] #1 thud n. [thump, thumping, clump, clunk] a heavy dull sound (as made by impact of heavy objects). wn

[2] #2 thud v. [thump] make a dull sound; "the knocker thudded against the front door". wn

[3] #3 thud v. strike with a dull sound; "Bullets were thudding against the wall". wn

[4] #4 thud v. [crump, scrunch] make a noise typical of an engine lacking lubricants. wn