Acidulating involves adding acid to a substance to make it more acidic. There are several synonyms for acidulating, such as souring, acidifying, tarting, and sharpening. These terms all refer to the process of increasing the acid levels in a substance. Souring and acidifying are the most common synonyms for acidulating. Tarting and sharpening are used less frequently but still convey the idea of changing the pH level of a substance to make it more acidic. Whether you're cooking, performing a scientific experiment, or adjusting the acidity of your soil, using synonyms for acidulating can help you communicate your intentions more clearly.