1. A heavy dull sound (as made by impact of heavy objects)
   "The thud of the falling tree shook the ground";
   - thump, thumping, clump, clunk, clonk

1. Make a dull sound
   "the knocker thudded against the front door";
   - thump
    
2. Strike with a dull sound
   "Bullets were thudding against the wall"

Derived forms: thudded, thudding, thuds

Type of: collide with, go, hit, impact, impinge on, run into, sound, strike

Encyclopedia: Thud