a sound like the one which is made when a heavy object hits something else His head hit the floor with a dull thud. She could hear the thud of her own heartbeat sounding heavily in her ears. She felt her heart give an extra thud. The boot made a dull thud as it hit the ground. Word Origin late Middle English (originally Scots): probably from Old English thyddan ‘to thrust, push’; related to thoden ‘violent wind’. The noun is recorded first denoting a sudden blast or gust of wind, later the sound of a thunderclap, which led to the sense ‘ a dull, heavy sound’. The verb dates from the early 16th cent.