oxidize
Definitions
To combine or cause to combine with oxygen.
To lose one or more electrons during a chemical reaction.
To cover or coat a substance with a layer of oxide, such as rust.
Examples
If you leave the iron gate outside in the rain, it will eventually begin to oxidize and rust.
The chemical process causes the metal surface to oxidize, changing its color from silver to a dull grey.
Our bodies naturally oxidize nutrients to produce the energy required for daily activities.