You searched for: “thump
bump, thump
bump (BUMP) (verb)
To strike against something with force: If that truck does not slow down, it will bump over the STOP sign.
thump (THUMP) (verb)
To hit or to knock with something heavy: The guests were frightened when they heard the resident ghost thump on the stairs going up to the attic.

When the maid dropped the bundle of laundry, we could hear it bump and thump down the stairs.