"Sour" is a taste that is often described as tangy or acidic. It is commonly found in foods like lemons, limes, and vinegar. When you bite into something sour, it can make your mouth pucker and your face scrunch up. This flavor is a key part of many dishes, adding a refreshing contrast to sweetness. In addition to food, "sour" can also describe emotions or situations. For example, a sour mood might mean someone is feeling grumpy or unhappy. Similarly, a sour relationship can indicate that things are not going well between people. Overall, sourness can be both a delightful taste and a way to express feelings.