"rusting" in the noun sense
1. rust, rusting
the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water
"rusting" in the verb sense
1. corrode, rust
become destroyed by water, air, or a corrosive such as an acid
"The metal corroded"
"The pipes rusted"
2. corrode, eat, rust
cause to deteriorate due to the action of water, air, or an acid
"The acid corroded the metal"
"The steady dripping of water rusted the metal stopper in the sink"
become coated with oxide
Source: WordNet® (An amazing lexical database of English)
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