Today's question comes from a student who was watching a movie. In this movie, one character said to another, "Get lost," so the student is asking what this expression means in context. Today, I'll explain this phrase and also teach you some other informal expressions with the word "get," such as get a grip, get off my case, get bent out of shape, and more.
That's just a small sampling of the many colorful informal expressions that we have in the English language using the word "get." In order to remember these phrases better, I suggest trying to write your own sentences with them! If you want to add more interesting expressions to your own English, join my 300+ English Idioms Course. Not only will you learn a lot of common idioms, but you'll also practice them with quizzes and short-answer exercises that you can send in for correction and feedback.