Thud (noun)

1. A dull sound, such as that made by a heavy object falling or striking something.
2. A blow or hit that produces a dull sound.

Origin:

From middle english "thudden" ("to strike with a weapon, thrash, beat"), akin to middle low german "dudde" ("blow, stroke").

Examples:

1. The book fell off the table with a thud.
2. The thud of the boxer's gloves hitting the punching bag echoed through the gym.
3. I heard a loud thud from the living room and went to investigate.
4. The wrestler delivered a thud to his opponent's chest.
5. The thud of the batter hitting the ball could be heard throughout the stadium.