tarnish
🇺🇸
/ˈtɑːrnɪʃ/
🇬🇧
/ˈtɑːnɪʃ/
To make metal lose its shine, often because of exposure to air or moisture.
If you don't clean them, your silver spoons will tarnish.
To make people think less highly of someone or something.
Her last project's failure tarnished her reputation.
A dull layer that forms on metal, making it less shiny.
The tarnish on the brass handles could be seen from a distance.