Cách sử dụng
The expression "flare up" is often used to describe a sudden outburst of something, such as a fire, an illness, or emotions. It can be used in many different contexts, such as when someone's angry or when an injury becomes painful again. An English learner might encounter this expression in a medical setting or when talking about emotions. For example, "My eczema flared up after I ate something I'm allergic to" or "My anxiety tends to flare up when I'm in crowds."