noun
a reddish-brown or orange coating that forms on iron or steel as a result of oxidation
verb
to deteriorate or become impaired due to neglect or lack of use
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The metal gate had started to show signs of rust due to prolonged exposure to the elements.
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I need to clean off the rust from my bike before I can start riding it again.
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That old car is so rusty, it's practically falling apart!
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Time had a way of rusting away at the memories, leaving them faded and worn.