Also means
out of practice (figurative)
Usage Note
rostig describes metal covered with rust — rostige Nägel, rostige Scharniere. Figuratively mein Französisch ist etwas rostig (my French is a bit rusty) is a common idiom. Derived from Rost (rust).
Examples
"Das rostige Gartentor quietschte bei jedem Öffnen."
Natural Translation
The rusty garden gate squeaked every time it was opened.
Literal Translation
The rusty garden gate squeaked at every opening.

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