Sounds of heavy things hitting the ground

THUDS

Listen for the dull, deep noise when something solid lands hard on the floor.

The clue describes the loud, dull noises made when something heavy lands or falls. "Thuds" perfectly fits because it’s the onomatopoeic word for that deep, blunt sound—like a book dropping or a boot stomping. There’s no hidden wordplay here; it’s a straightforward definition matching the answer.