The term decaying refers to something that is gradually falling apart, deteriorating or breaking down over time. It can be used to describe a physical object, such as a building or bridge, which has become weakened and damaged due to exposure to the elements, age or neglect. Decaying can also refer to a biological process where organic matter breaks down into simpler forms of matter, often through natural processes like decomposition or putrefaction. In this context, decaying would mean something that is rotten or spoiled and no longer usable.