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     1. n. The deteriorated state of iron or steel as a result of moisture and oxidation.
           The rust on my bicycle chain made cycling to work very dangerous.
     2. n. A similar substance based on another metal (usually with qualification, such as copper rust).
           aerugo. Green or blue-green copper rust; verdigris. (American Heritage Dictionary, 1973)
     3. n. A reddish-brown color.
           (color panel, B7410E)
     4. n. A disease of plants caused by a reddish-brown fungus.
     5. v. (intransitive) to oxidize, especially of iron or steel.
           The patio furniture had rusted in the wind-driven spray.
     6. v. to cause to oxidize.
           The wind-driven spray had thoroughly rusted the patio furniture.
     7. v. (intransitive) To be affected with the parasitic fungus called rust.
     8. v. (figuratively) To degenerate in idleness; to become dull or impaired by inaction.

Example Sentences

It also removes rust from chromium bumpers. 

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