1. (

• thud ,
• thump

) make a dull sound; "the knocker thudded against the front door" ;

2. (

• thud

) strike with a dull sound; "Bullets were thudding against the wall" ;

3. (

• crump ,
• thud ,
• scrunch

) make a noise typical of an engine lacking lubricants ;

1. (

• dull ,
• thudding

) not clear and resonant; sounding as if striking with or against something relatively soft; "the dull thud"; "thudding bullets" ;