Gets creaky, say

• Loses limberness
• Becomes inoperable, maybe, as an old machine
• Corrodes, as iron
• Yields to oxidation
• Autumnal colors
• Shows signs of age, in a way
• Shows disuse
• Red coats?
• Becomes oxidized

Wiktionary Word definitions in Wiktionary
vb. (en-third-person singular of: rust )