The Vietnamese word "mụt" primarily refers to a "boil" in English, which is a painful, pus-filled bump that forms under the skin due to infection. It is often swollen and can be quite uncomfortable.
In more advanced contexts, "mụt" might be used metaphorically to describe something that is troubling or problematic. For instance, one might say that a situation is like a "mụt" if it is causing ongoing pain or discomfort.