Cách sử dụng
"Crack up" is an expression used informally to mean to laugh a lot or to lose control while laughing. For example, you might say "I cracked up when I heard my friend's joke." It could also mean that someone has had a mental breakdown or become very emotional. For instance, you might say "I think the stress of the job is starting to make him crack up." It's important to understand the context in which the expression is being used to avoid confusion or misunderstanding.