American Dictionary of the English Language

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RUST, noun [Gr. probably from its color, and allied to ruddy, red, as Latin rubigo is from rubeo. See Ruddy.]

1. The oxyd of a metal; a substance composed of oxygen combined with a metal, and forming a rough coat on its surface. All metals except gold are liable to rust

2. Loss of power by inactivity, as metals lose their brightness and smoothness when not used.

3. Any foul matter contracted; as rust on corn or salted meat.

4. Foul extraneous matter; as sacred truths cleared from the rust of human mixtures.

5. A disease in grain, a kind of dust which gathers on the stalks and leaves.

RUST, verb intransitive

1. To contract rust; to be oxydized and contract a roughness on the surface.

Our armors now may rust

2. To degenerate in idleness; to become dull by inaction.

Must I rust in Egypt?

3. To gather dust or extraneous matter.

RUST, verb transitive

1. To cause to contract rust

Keep up your bright swords, for the dew will rust them.

2. To impair by time and inactivity.