thud
       n : a heavy dull sound (as made by impact of heavy objects)
           [syn: thump, thumping, clump, clunk]
       v 1: make a dull sound; "the knocker thudded against the front
            door" [syn: 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,
           scrunch]
       [also: thudding, thudded]
  thudding
       adj : not clear and resonant; sounding as if striking with or
             against something relatively soft; "the dull thud";
             "thudding bullets" [syn: dull]