Definitions

1. adjective

covered or discolored with a reddish-brown oxide of iron, as a result of exposure to air and moisture

“The rusty old bike was left in the garden for years.”

2. noun

a reddish-brown oxide of iron formed by the oxidation of iron or its alloys, especially when exposed to air and moisture

“The scientist studied the properties of rusty iron in various environments.”

3. verb

to become covered or discolored with a reddish-brown oxide of iron, as a result of exposure to air and moisture

“The metal rusty quickly in the damp climate.”

4. verb

to make or become less effective or efficient due to lack of use or practice

“After not playing the piano for years, my skills started to rusty.”