tarnish

This term describes a loss of brilliance, whether physical or social. When applied to metals, it evokes a chemical dulling or a thin film of corrosion that obscures a reflective surface, suggesting a slow, environmental decay rather than sudden damage. In a social context, the word carries a heavy weight of permanent or lasting damage to a reputation. It implies that a once pristine image has been stained by a specific event or scandal, making the loss of prestige feel indelible and shameful.