Definitions

1. noun

a dull, heavy sound, typically made by something falling or hitting the ground

“The package landed with a thud on the porch.”

2. verb

to make a dull, heavy sound, typically by falling or hitting the ground

“The book thudded to the floor.”

3. interjection

used to express shock or surprise, especially at something unpleasant or unpleasantly surprising

“Thud! The news of his death hit me like a ton of bricks.”