Meaning

• To lose one's way.

  "Don't you have a map? How did we get lost?"

• To be absent, to seem to be absent.

  "The violins get lost with the rest of the music."

• (usually in imperative and reported speech) To exit from the scene.

  "I don't want to have to tell you again: Get lost!"

Meaning

• (dismissal) Used to rudely tell somebody to go away or leave one alone.