Cách sử dụng
The expression "out to lunch" means that someone is not paying attention or is not available because they are physically or mentally absent. It is often used to describe someone who is not aware of what is happening or who is not actively participating in a conversation or activity. For example, if someone is daydreaming while everyone else is discussing something important, you might say that person is "out to lunch." It can also be used to indicate that someone is not working or not doing their job properly. It is important to note that this expression is somewhat informal and may not be appropriate in all situations.