What is the meaning of rusting?

noun

• The formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water.
  • synonyms: rust

verb

• Become destroyed by water, air, or a corrosive such as an acid.
  • usage: "The metal corroded"; "The pipes rusted"
  • synonyms: corrode, rust
• Cause to deteriorate due to the action of water, air, or an acid.
  • usage: "The acid corroded the metal"; "The steady dripping of water rusted the metal stopper in the sink"
  • synonyms: corrode, eat, rust
• Become coated with oxide.
  • synonyms: rust