Cách sử dụng
The expression "have a screw loose" means that someone is acting in a strange or irrational way, or not thinking clearly. It can also refer to someone who is mentally unstable. For example, if someone is constantly talking to themselves and behaving erratically, someone else might say "He must have a screw loose!" The expression is often used in casual or humorous conversation, but it can also be considered offensive if used inappropriately. It is important to note that this expression should not be used to describe someone who has a diagnosed mental illness or disability.