1. the process of rotting or decomposing
2. a gradual decline in strength, quality, or condition

1. to rot or decompose gradually
2. to decline gradually in strength, quality, or condition

Examples

• The old wooden fence showed signs of decay after years of rain.
• Tooth decay can be prevented with proper dental hygiene.
• The abandoned building fell into decay over the decades.
• Leaves decay naturally on the forest floor.
• Without maintenance, the bridge began to decay rapidly.
• The decay of the Roman Empire took several centuries.
• Bacteria cause food to decay if left unrefrigerated.