To make acidic; to increase the acid content or lower the pH of a substance.
From Latin 'acidus' (sour) combined with '-ify' (to make or cause to become). Emerged in chemical terminology in the 18th century as chemists described reactions.
When you squeeze lemon juice into water, you acidify it—and this simple verb describes one of the most important chemical processes in our bodies, from digestion to maintaining blood chemistry.
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