thud

Noun

• a heavy dull sound (as made by impact of heavy objects)

Verb

• make a noise typical of an engine lacking lubricants

• strike with a dull sound
  • Bullets were thudding against the wall
    

• make a dull sound
  • the knocker thudded against the front door
    

Related words

• Synonyms: 
  thump , thumping , clump , clunk , crump , scrunch