the process of rotting or decomposing

a decline in health, strength, or quality

स्वास्थ्य, ताकत या गुणवत्ता में गिरावट

English Usage: There was a noticeable decay in the building's structure over the years.

Hindi Usage: वर्षों में भवन की संरचना में एक स्पष्ट गिरावट थी।