Acetifying refers to the process of converting a substance into acetic acid or its derivatives. It is a term primarily used in chemistry but can also be used in cooking or brewing. Synonyms for acetifying include acidifying, souring, fermenting, pickling, and vinegaring. Acidifying refers to the process of adding an acidic substance to a substance to lower its pH level. Souring refers to the process of adding an acidic substance to food to give it a sour flavor. Fermenting refers to the chemical breakdown of a substance by bacteria or yeast to produce alcohol or acid. Pickling involves preserving food in a solution containing acetic acid. Vinegaring refers to the process of adding vinegar to a substance to make it acidic.