THUD

suggestive of a dull sound, as of a heavy object dropping on a soft, solid surface. Used figuratively in this sense. —Academy Level IV Glossary

suggestive of a dull sound, as of a heavy object dropping on a soft, solid surface. Used figuratively in this sense. That's an awfully good drill, and that drives it home with a thud. -The Itsa Line (20 Aug. 63) suggestive of a dull sound, as of a heavy object dropping on a soft, solid surface. Used figuratively in this sense.