- To make something acidic or sour.
- To increase the acidity of a solution.
From the latin word "acidus" meaning "sour" and the suffix "-ify" meaning to make or cause to be, the word was first used in the 18th century in english.
- Lemon juice can acidify water.
- The acid rain acidified the lake.
- He acidified the soil to make it more suitable for certain plants.
- The vinegar was used to acidify the marinade.
- The acidifying agent was added to lower the pH of the solution.