DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   thud
       n 1: a heavy dull sound (as made by impact of heavy objects)
            [syn: thump, thumping, clump, clunk, thud]
       v 1: make a dull sound; "the knocker thudded against the front
            door" [syn: thud, thump]
       2: strike with a dull sound; "Bullets were thudding against the
          wall"
       3: make a noise typical of an engine lacking lubricants [syn:
          crump, thud, scrunch]