Meaning of “rusty” in the English Dictionary

"rusty" in American English

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us /ˈrʌs·ti/

(esp. of a person) not as good at knowing or doing something as you once were, because you have not practiced it in a long time:

We’re a little rusty after having the summer off.

(of the surface of something made of iron or steel) covered with a red-brown substance that formed as a result of decay caused by reacting with air and water:

People would toss their soda cans into rusty old barrels.

(Definition of “rusty” from the Cambridge Academic Content Dictionary © Cambridge University Press)