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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. (ambitransitive, figuratively) To (cause to) degenerate in idleness; to make or become dull or impaired by inaction.

Example Sentences

As rust eats iron, so care eats the heart. 
Before you put the knife away, please wipe it dry so that it will not rust. 

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