Meanings
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1
adj
Covered with rust, the reddish-brown coating that forms on old metal.
The gate was old and rusty and would not open.
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2
adj
No longer good at something because you have not practiced it for a long time.
My French is a little rusty since I haven't spoken it in years.
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3
adj
Having the reddish-brown color of rust.
The autumn leaves had turned a rusty brown.
Thesaurus
Etymology
Ellipsis of rusty one more often used for this, or from the general epithet rusty given to various particular firearm names—earlier both were applied in Cockney rhyming slang for other machines, including swords in their day, but the present coinage has not more than a loose connection to this and is from the preference for used or antique firearms due to their being easier or cheaper to obtain.