The term "debris buildup" refers to an accumulation or collection of debris, which can be any waste material or discarded substances. This may include rubbish, junk, trash, or other unwanted items that have been left behind, gathered, or collected in a particular location over time. The phrase is often used to describe the buildup of objects such as rocks, sand, ice, or vegetation on a surface, particularly one that moves or experiences constant activity, like an airport runway or spacecraft surface. Debris buildup can pose safety hazards and may require regular cleaning, maintenance, or removal to prevent damage or accidents from occurring.