1. the process of forming rust; corrosion of metal

1. present participle of rust; forming rust or causing to form rust

Examples

• The old car is rusting in the backyard.
• Salt water accelerates the rusting of metal.
• We painted the fence to prevent rusting.
• The rusting of the bridge required immediate attention.
• Iron tools left outside are rusting quickly.
• The rusting process can be slowed with proper care.
• She noticed the gate was rusting at the hinges.