thud


thud (http://definr.com/thud)

     n : a heavy dull sound (as made by impact of heavy objects)
         [syn: thump, thumping, clump, clunk]
     v 1: make a dull sound [syn: thump]
     2: strike with a dull sound; "Bullets were thudding against the
        wall"
     3: make a crunching noise, as of an engine lacking lubricants
        [syn: crump, crunch, scrunch]