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rust2 [intransitive and transitive]
HCE to become covered with rust, or to make something become covered in rust : 
The metal had begun to rust.The gate was old and badly rusted.
The metal had begun to rust.The gate was old and badly rusted.rust away
phrasal verbHCE to be gradually destroyed by rust : The blades of the swords have rusted away.
The blades of the swords have rusted away.